Answer:
after photo-autotrophic prokaryotes evolved
Large amounts of oxygen gas appeared in Earth's atmosphere about 2.7 billion years ago after photo-autotrophic prokaryotes evolved.
What is the reason that Large amounts of oxygen gas appears about 2.7 billion years ago?The reason that large amounts of oxygen gas appear is that after the evolution of photo-autotropic prokaryotes.Photoautotrophs are cells that capture light energy.Photoautotrophs used carbon dioxide as their carbon source.There are many examples of Photoautotrophic prokaryotes like cyanobacteria.Photoautotrophic prokaryotes use similar compounds to those of plants to trap light energy.Hence, after photo-autotrophic prokaryotes evolved is the correct answer.
Therefore, option A is the correct answer.
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What property of dna makes it possible for a probe to find a single-stranded dna target gene?
Answer:
Complimentary base pairings
Answer:
-Complementary base pairing
Explanation:
DNA probes can be defined as fragments of single stranded DNA molecules, which are used to to detect the presence of target DNA sample. The nucleotide sequence in probes is complementary to the nucleotide sequence of target DNA.
Hence, probes detect DNA by hybridizing to single stranded target DNA according to complementary base-pairing rule. Nitrogen bases present in probe and target DNA make hydrogen bonds with each other (adenine binds with thymine and guanine binds with cytosine (and vice versa) and target DNA is detected.
Thus, the correct answer is 'complementary base-pairing.'
Fracisco's game involves 3 green, 2 yellow, 4 red, and 3 black marbles. If he randomly draws three marbles from the bag, without replacement, what is the probability that he will draw yellow, and then red, and then black?
Answer:
there are 12 marbles. the probability of getting a yellow would be 2/12, the probability of drawing a red is 4/12, and the probability of getting a black is 3/12. (i think,, dont quote me if im wrong!)
:) have a nice day love ❤
Explanation:
Answer:
1/55
Explanation:
(2/12) X (4/11) X (3/10) = .018
The photograph shows a consequence of air pollution. Which of these does the photograph show?
A - Bioremediation
B - Acid deposition
C - Eutrophication
D - Ozone depletion
Answer:
C. Eutrophication
Explanation:
body of water becomes overly enriched with minerals and nutrients which induce excessive growth of algae. This process may result in oxygen depletion of the water body.
Answer:
C - Eutrophication
Explanation:
Presence of pollutants in air such as nitrogen and phosphorus leads to entry of these pollutant in water bodies along with rain water. Presence of excess organic compounds in water is called as eutrophication. Eutrophication favors excessive algae production in water. Green algae growing on the surface of water is shown in the image. The Increased algal population consumes oxygen present in water and makes it unavailable for aquatic animals such as fishes leading to their death
What three processes happen in every geological period?
Answer:
Mass extinctions, Wegenerian cycles, and the emergence of new life forms
Explanation:
Answer:
The correct answer is mass extinctions, Wegenerian cycles, and the emergence of new forms of life.
Explanation:
Every geological period is featured by the occurrences of Wegenerian cycles, mass extinction, and the origination of novel forms of life. The boundaries of the majority of geologic periods are generally mass extinction periods and this mass extinction stimulates the formation of new forms of life.
At the time of the geologic period, an array of tectonic activities plays an essential part as a consequence of the internal functioning of the Earth. The splitting of the continents takes place and arising of new landform at the plate boundaries takes place. This is termed as Wegenerian cycle.
Complete these sentences by selecting the correct answers from the drop-down menus.
After one half-life,__ % of the atoms will change to a stable isotope and__ % will remain radioactive.
After three half-lives,__ % of the atoms will change to a stable isotope and__ % will remain radioactive.
-12.5
-25
-50
-75
-87.5
Please help me i can't quiet figure it out hehe I'll give you 25 points
Answer:
I took the test in K12, the correct answer is
After one half-life, 50% of the atoms will change to a stable isotope and 50% will remain radioactive.
After three half-lives, 87.5% of the atoms will change to a stable isotope and 12.5% will remain radioactive.
Give me Brainliest
After one half-life, 50% of the atoms will reverse to a stable isotope and 50% will stay radioactive.
What do you mean by Half-life?Half-life may be defined as the time required for the radioactivity of a specified isotope to drop to half its initial value.
After three half-lives, 87.5% of the atoms will reverse to a stable isotope and 12.5% will stay radioactive.
When the initial value of any compound is 100%, after one half-life, it will reduce to 50%, after the second half-life, it will reduce to 25%, after the third half-life, it will reduce to 12.5%, and goes on.
Therefore, it is well described above.
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What is a mnemonic device to help you remember the elements that life needs to survive?
Answer:
mrs gren
Explanation:
movement, respiration, sensitivity, growth, reproduction, excretion, nutrition
Use CHNOPS as a mnemonic device to remember essential life elements.
To help remember the elements that life needs to survive, you can use the mnemonic device CHNOPS, which stands for Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, and Sulfur. This mnemonic device aids in recalling these essential elements for living organisms.
There are six kingdoms of living things. Archaebacteria is one of these kingdoms. What are the other kingdoms of living things?
Select the five correct answers.
A)Animalia
B)Planta
C)Fungi
D)Arthropods
E)Protista
F)Eubacteria
Answer:
A, B, C, E, F
Explanation:
Arthropods are in the kingdom animalia
The other kingdoms of living things include the following:
AnimaliaPlantaeFungiProtistaEubacteriaWhat are Living things?These are organisms which exhibit or demonstrate the presence of life in them.
Living things comprises of several kingdoms which are listed above and are the most appropriate choices.
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the whale shark has rows of teeth despite being a filter feeder. what’s the best explanation of this feature?
A. the whale sharks teeth are an example of vestigial structures, if an inherited feature is no longer needed but also not harmful, there’s no evolutionary pressure to get rid of it
B. the whale sharks teeth are an example of of analogue structures. teeth exist in almost every sea creature, and the whale would be at a defensive disadvantage without them.
C. the whale sharks teeth are an example of homologous structures. other mammals also have teeth, and different teeth in humans have different shapes to serve different functions.
D. the whale sharks teeth are an example of embryonic structures. the teeth buds develop early enough in embryogenesis that the whale shark is still born with teeth.
Answer:
not sure i think a!
Explanation:
The correct answer is A The whale sharks teeth are an example of vestigial structures, if an inherited feature is no longer needed but also not harmful, there’s no evolutionary pressure to get rid of it
Explanation:
In biology, a vestigial structure refers to certain features such as organs or even behaviors that do not have a function or purpose in an organism but are still preserved usually because they do not represent a disadvantage for the organism. This occurs in the case of whale sharks teeth that despite being filter feeders, which means they feed on small organisms such as plankton they still have teeth, that they do not use for feeding or any other function, do not represent a harmful feature but might have a function in the past. Therefore, the best explanation for the teeth of whale sharks is that these are an example of vestigial structure, that was inherited but are not harmful and therefore they are still preserved as there is not an evolutionary pressure to get rid of them.
people with heart problems often have trouble breathing.
why would this happen?
A. the pumping of the heart is tied to the respiratory system.
B. red blood cells are produced in the lungs.
C. the heart provides the lungs with oxygen.
D. the lungs are the organs that bring carbon dioxide into the body.
Answer:
A-the pumping of the heart is tied to the respiratory system
People with heart problems often have trouble breathing because of the pumping of the heart is tied to the respiratory system.
How Circulatory System is connected with Respiratory System?The Heart and Lungs work together to make sure that the body has the oxygen rich blood that needs to function properly.
The close connection between Heart and Lungs means that breathing problems can be caused by the issues either in lungs or in heart.
Functions performed by Heart and Lungs:
1. The Pulmonary Loop- The right side of the heart picks up the oxygen poor blood from the body and moves it to the lungs for cleaning and re-oxygenating.
2. The Systematic Loop- Once the blood is oxygenated, the left side of the heart moves the blood throughout the body so that every part receives the oxygen it needs.
Common Problems related to the Heart/ Lungs are:
- Exercise intolerance
- Fatigue
- Irregular heartbeats
- Asthma
- Bronchitis
- Shortness of breath
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You find an organism that can only be seen under a microscope. When you examine it, you cannot find a nucleus but you see a nucleoid region. What is a likely classification for this organism?
A. Prokaryotic
B. Eukaryotic
C. Unicellular
D. Multicellular
Prokaryolotic so a would be the answer
Answer:
a
Explanation:
The following diagram model DNA replication. match letter to location or structure.
Please help I promise to Mark Brainlest!
In the given diagram model of DNA replication, the labels are marked as follows:
A) Replication fork
B) DNA Polymerase
C) Sugar Phosphate Backbone.
The detailed explanation is as follows:
A) DNA Replication Fork:
The DNA replication fork is a critical structure formed during DNA replication, a fundamental process in cell division and genetic inheritance. It represents the point at which the DNA double helix unwinds and separates into two single strands, creating a Y-shaped structure. This unwinding and separation occur due to the action of enzymes called helicases, which break the hydrogen bonds between complementary base pairs.
At the replication fork, each single DNA strand serves as a template for the synthesis of a new complementary strand. DNA polymerases, the enzymes responsible for DNA synthesis, work at the replication fork. One strand, called the leading strand, is synthesized continuously in the 5' to 3' direction, while the other, the lagging strand, is synthesized in short fragments called Okazaki fragments, which are later joined by DNA ligase.
B) DNA Polymerase:
DNA polymerases are a group of enzymes that play a central role in DNA replication and repair. These enzymes are responsible for synthesizing new DNA strands by adding nucleotides to the growing DNA chain, using an existing template strand as a guide. DNA polymerases ensure the accurate replication of genetic information.
These enzymes work in a highly coordinated manner during DNA replication. DNA polymerases add nucleotides to the 3' end of the growing DNA strand in a 5' to 3' direction, complementary to the template strand. They require a primer, typically a short RNA or DNA sequence, to initiate DNA synthesis.
There are multiple types of DNA polymerases in cells, each with specific functions. DNA polymerase III, for example, is the primary enzyme responsible for replicating the bacterial chromosome during DNA replication.
C) Sugar-Phosphate Backbone:
The sugar-phosphate backbone is a structural component of the DNA molecule. It consists of alternating deoxyribose sugar molecules and phosphate groups, linked together by strong covalent phosphodiester bonds. The sugar-phosphate backbone runs along the outside of the DNA double helix and provides structural stability to the molecule.
The nitrogenous bases (adenine, thymine, cytosine, and guanine) project inward from the sugar-phosphate backbone and form the base pairs that connect the two DNA strands. The complementary base pairing between adenine and thymine (A-T) and between cytosine and guanine (C-G) ensures the specific and accurate coding of genetic information.
The sugar-phosphate backbone also plays a crucial role in protecting the genetic information stored within the DNA molecule by shielding the bases from chemical and physical damage. Additionally, it serves as the attachment point for various proteins and enzymes involved in DNA replication, transcription, and other cellular processes.
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Which of the following statements is true?
There are more species of vertebrates than invertebrates
The largest phylum in the Animalia kingdom is Arthropoda
Sponges are not truly animals because they have cell walls,
All animals in the Chordata phylum are vertebrates
Answer:The largest phylum in Animalia is Arthropoda.
Explanation: the first is wrong because there’s over 1,000,000 discovered species of invertebrates and less than 70,000 describes species of vertebrates
The third is wrong because sponges are animals albeit basal and they don’t have cell wall
The fourth is wrong because there are two subphyla in chordata that aren’t vertebrates: Cephalochordata and Urochordata
The true statement is that the largest phylum in the Animalia kingdom is Arthropoda.
The correct option is B.
What are Arthropods?Arthropods are a member of the phylum Arthropoda.
They mainly contain insects, crustaceans, arachnids.
The main characteristics of arthropods are jointed legs, bilateral symmetry, and segmented body.
Thus, the correct statement is option B, The largest phylum in the Animalia kingdom is Arthropoda.
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Which of these is a parasite that lives inside its host? A) flea B) heartworm C) mite D) tick
Answer:
heartworm!
Explanation:
what are the main sources of non point source pollution
Answer:
Major non-point source pollutions come from agricultural runoff, construction sites, erosion of land due to deforestation, etc.
What is the relative humidity percentage when the “real feel” is 108 degrees F and the temperature is 96 degrees F?
Answer:
The answer is B. Relative humidity percentage will be 50 %.
Explanation:
Relative humidity is the percentage of water vapors in the air at a particular temperature compared to the how much it can hold at that temperature. if the relative humidity is high (100%) we feel hotter than the actual temperature because water will not evaporate due to air saturation. in this case as the real feel is 108 F at 96 F the relative humidity will be 50 %.
Final answer:
To find the relative humidity based on the 'real feel' temperature of 108 degrees F and an air temperature of 96 degrees F, one would use a Heat Index Chart or calculator. However, without additional information on the actual humidity level, it's not possible to determine the exact relative humidity percentage from just these temperatures.
Explanation:
The question about calculating the relative humidity when the "real feel" is 108 degrees F and the temperature is 96 degrees F requires knowledge of the Heat Index and water vapor density. The Heat Index is a measure that takes into account the relative humidity and temperature to determine how hot it actually feels. To determine the relative humidity given these temperatures, one would typically refer to a Heat Index Chart, which correlates temperature and humidity levels with the perceived temperature. However, without knowing the actual relative humidity or having access to a Heat Index Chart, the exact relative humidity percentage cannot be determined from just the "real feel" and air temperature. Normally, the relative humidity can change as the temperature changes, if the water vapor density remains constant.
What are local problems that the endangerment of honeybees causes?
Answer:
Pollination
Explanation: If you have ever seen bee movie, you know that pollen is the most essential ingredient to flowers, which is transported and spread by bee's. if there were no more bees, there would be no way to pollinate the flowers, causing them to wither and die. Fortunately, there are other pollinators, but bees are one of the most important.
,
21. Wood storks use their long beaks to feel around in shallow water until they find small fish, which they snap up and
eat. Their feeding style is dependent on the natural flood and drain cycles of the Everglades.
Populations of wood storks in the Everglades declined from an estimated 4000 pairs in the 1930s to about 250
pairs in the 1980s. Which human activity has contributed MOST to the reduction of wood stork populations?
building structures on stork breeding grounds
building channels to control water flow in the Everglades
Using stork feathers in clothes
Disturbing storks while boating hunting and sightseeing in the area
building channels to control water flow in the everglades
Explanation:they depend n the fish in the everglades and the waterflow affetcs the way they get the fish
Answer:
Option B, building channels to control water flow in the Everglades
Explanation:
The nesting pattern of wood storks is highly dependent on the pre drainage condition of Everglades region.
However in Everglades region several canals, ditches and roads have been constructed in recent times due to which the drainage pattern and wetland fragmentation is disturbed through out the region. This has lead to the reduction in the nesting activity of Wood Stork across the Everglades which has ultimately caused reduction of wood stork population.
Hence, Option B is correct.
The skeletal diagram below shows variations that were present in their common ancestor. Using the diagram determine what most likely caused the variation in forelimbs?
A
changes in the genetic code
B
changes in muscle structure
C
development of vestigial structures
D
trait formation due to behaviors
Answer:
D. trait formation due to behaviors
Explanation:
It is obvious to see that the three animals, cat, whale, and bat, have the same basic structure of their forelimbs, but also that they have developed differently and have taken a new shape. The reason for this is a trait formation due to behavior. The cats ancestors were terrestrial, and the cats have remained terrestrial, walking on their four legs, and having the same shape and function as their ancestors. The whales had similar forelimbs, but their ancestors started to move more and more in water. As they did, they needed more muscle power, but also greater width of the forelimb so that they can move more easily and more efficiently in the water. This behavior has gradually resulted in a flat, strong, peddle like forelimb. The bat too had similar forelimbs to that of the cat, but its ancestors started to try to fly. The process was gradual, and it started with jumping, then longer jumps, development of skin between the fingers, elongation of the fingers, thus provide more area for development of wider skin area. This has resulted in developing a light, wide, skin dominated forelimb with elongated fingers, providing flight for the bat.
Choose the best explanation of the difference between evolution and natural selection. A. Natural selection is the idea that species change over time, and evolution is the idea that the species' food source also changes over time. B. Evolution is the idea that species change over time, and natural selection is the idea that nature changes over time. C. Natural selection is the idea that species change over time, and evolution is the idea that our world changes over time. D. Evolution is the idea that species change over time, and natural selection is a mechanism by which evolution takes place.
Answer:
D. Evolution is the idea that species change over time, and natural selection is a mechanism by which evolution takes place.
Explanation:
ornithology and ichthyology are both the studies of types of mammals
False. Ornithology is study of birds and ichthyology is of bony fish
Ichthyology studies fish, while ornithology examines birds. Mammals are unrelated to either.
The fields of ornithology and ichthyology do not study mammals. Fish is studied by the field of Ichthyology, whereas birds are studied by Ornithology. Although they are classified as vertebrates, fish and birds are not mammals. Mammary glands and hair are characteristics of mammals.
Mammals are a class of animals that have glands for producing milk and hair. Mammals include creatures like dogs, humans, and whales.
In summary, Ichthyology examines fish, while Ornithology investigates birds. Neither has to do with animal kinds. Mammary glands and hair are two characteristics that set mammals apart.
which of the following best characterizes an ecological footprint
Answer:
According to one data set, the average American has has an ecological footprint over four times larger than the global average.
Answer:
a measure of environmental impact
Explanation:
APEX
compare and contrast the reproductive cycles of a flowering plant and a human. include two similarities and two differences
The similarities between the reproductive cycles of a flowering plant and a human are given below:
Both humans and flowering plants require two parents to develop offspring. (Erotic reproduction)Both the resultant offspring are fertile in nature which grow, mature, and reproduce. What do you mean by Reproduction?Reproduction may be defined as a biological process that involves the formation of a resultant offspring identical to their parents.
The dissimilarities between the reproductive cycles of a flowering plant and a human are given below:
Human produces baby, while plant produces seeds. Human performs the process of fertilization through sperm and egg cell, while plants perform the same process through pollen and ovarian germ cells.Therefore, the two similarities and dissimilarities between the reproductive cycles of a flowering plant and a human are briefly described above.
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Why does only one egg, rather than four eggs, develop during oogenesis, given that spermatogenesis results in four sperm formed from one stem cell? Why does only one egg, rather than four eggs, develop during oogenesis, given that spermatogenesis results in four sperm formed from one stem cell? Once formed, spermatids, but not oocytes, undergo additional rounds of division by mitosis. Unequal cytoplasmic division ensures that a fertilized egg has ample nutrients for its journey to the uterus. The egg does not go through the meiotic division processes that the sperm undergo. Only one egg can be fertilized at a time.
The unequal cytoplasms division that results in one egg and three polar bodies ensures that a fertilized egg has ample nutrients for its journey to the uterus
Which of the following is the BEST example of primary succession? A forest develops on abandoned farmland A forest develops on the edge of a retreating glacier A forest develops in the area of a forest fire A forest develops in the area of a devastating flood
Answer:
Explanation: Primary succession is one of two types of biological and ecological succession of plant life,Occurring in an environment in which New substrate devoid of Vegetation and other organisms usually lacking soil,such as lava flow or area left from retreated glacier,is deposited. Sorry if I didnt gave answer I still don't know what the answer is so I'm hopeing this explanation will find your answer...good luck!
The best example of primary succession is forest develops on abandoned farmland.
WHAT IS PRIMARY SUCCESSION?Primary succession is a type of ecological succession that begins in areas where they have been no form of life i.e. areas where there is no soil.
In primary succession, certain organisms called pioneers develop on bare land until the community becomes stable.
Therefore, the best example of primary succession is forest develops on abandoned farmland.
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[True or False]
If this were a model of the atom, the nucleus would be in same place as the sun
Answer:
true
Explanation:
Answer:
i think it is false
Explanation:
an nucleus can be anywhere in a cell sorry if im wrong
Please help me
Thanks
Answer:
D. Stationary front.
Explanation:
Answer: Im pretty sure the answer would be a stationary front
Explanation:
Single called organisms that love moisture
Answer:
Single celled organism that love moisture is yeast.
Explanation:
Yeast is a single cell organism that is grouped with kingdom fungi. The commonly known yeast is Saccharomyces cerevisiae that is used for baking and brewing industry. Yeast fermentation requires moisture and a warm environment. The moisture and carbohydrates are hydrolyzed during fermentation process to the simple sugars.
A form of asexual reproduction in which offspring grow from a part of a parent plant is called
Asexual reproduction is a type of reproduction, in which a single parent produces offspring having the same genetic information.
The form of asexual reproduction in which offspring grow from a part of a parent plant is called budding.
Budding can be explained as:
Budding is a mode of asexual reproduction, in which the offspring grows from the body part of the parent.Budding is seen in the hydra. The bud develops from the part of the body, which grows and detaches itself upon maturation.Thus, the correct answer is budding.
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R-selected species often experience growth in population giving an curve in a graph
Answer:
R-selected species often experience EXPONENTIAL growth in population, giving a J-SHAPED curve on a graph.
R-selected species are those that have high growth rate. These species may produce many offspring but not all will survive into adulthood.
Answer:
1. EXPONENTIAL
2. J-SHAPED
Explanation:
took test got 100
If two inedible insects share common colors, they may be warning a predator. This type of defense is called _____. Müllerian mimicry Mallerina mimicry Batesian mimicry
Answer:
Mullerian mimicry
Explanation:
The Mullerian mimicry is a type of mimicry where two or more organisms that are not closely related have mimicked each other for the benefit of all of them. This occurs usually at species that are not closely related, but are similar in size and often in shape. Both species have a proper defense mechanism, being very toxic, containing some acids, being uneatable, but in order to avoid injuries or mistaken attacks, they have also developed a warning signal, usually manifested through their coloration. Both species develop the same type of coloration and patters, making them look almost identical. This is for the benefit of both species, as the predators that they have in common will avoid both species by thinking that it is only one species that is not good for eating, thus having it more easy for remembering and avoiding, especially when it comes to the younger individuals of the predators.
Answer:
Mullerian
Explanation:
Mullerian mimicry is one in which BOTH the mimic and the model are BOTH dangerous to the potential predator and there is no distinction between the mimic and the model.
both dangerous to the potential predator = two INEDIBLE insects, as the question is worded. was correct after graded in ody ssey