The number of covalent bonds that an atom tends to form is equal to:
A: the number of valence electrons.
B: the number of unbalanced neutrons.
C: the number of unpaired electrons.
D: the atomic number.
E: the number of nearby atoms.
Number of covalent bonds by an atom is equal to number of unpaired electrons.
Explanation:Valency of an atom is defined as the combining capacity of an atom. Valence electrons are defined as the number of electrons in the outermost shell of an atom.
Now for an atom, when more than one electrons are present, then they often forms a pair. Like for example, if there are 7 valence electrons, 6 get as pairs and only one electron is unpaired. So this is why the halogens like fluorine, chlorine etc has the Valency of 1. For oxygen, 4 valence electrons become paired. And rest 2 electrons form 2 covalent bonds.
In which way does mining help society?
O
A. A single mine can dispiace wildlife for decades.
O
B. Minerals and energy resources are extracted.
O
C. Underground mining can be dangerous for workers.
O
D. Mines produce waste materials that enter ecosystems.
SUBM
Answer:
Explanation:
The only answer that helps society is B
Minerals and energy resources are extracted.
Answer:
B. minerals and energy resources are extracted
Explanation:
i just took it
Where do animal cells get the molecules, such as proteins, that they use for growth, repair and other life processes?
Animals get protein from diet.
Explanation:Proteins are one of the important part of diet which constitute about one fifth of an ideal diet. This proteins are formed of amino acids. There are 20 amino acids in nature, of which 9 are essential amino acids and 11 are non essential amino acids. The non essential amino acids are prepared in our body by enzymes. But the essential amino acids are needed to be supplied from outside via diet to get access to. So proteins are needed to be present in diet.
Answer:
The cells make them from materials the animal takes in from the environment.
Explanation:
which did scientists know about molecular genetics in the early 1900s?
Answer:
Chromosomes, Mutation, and the Birth of Modern Genetics: Thomas Hunt Morgan. In 1900 several scientists across Europe came to the same realization about heredity that Mendel had some 40 years before. But they arrived at the discovery from a very different direction.
Explanation:
Answer:
A. Chromosomes carry genetic information.
Explanation:
What information on a pedigree can tell you whether a gene is a autosome or a sex chromosome ???
Answer:
What information on a pedigree can tell you whether a gene is on a autosome or not a sex chromosome? If in a pedigree, the occurrence of the disorder is 50/50 between females and males, then it shows that it is autosomal. If the disorder is mostly shown in males then it is a sex-linked trait.
Explanation:
Advances in technology have enabled scientists and researchers to better study the evolutionary relationships between species. Match each field of study to its description. embryology developmental biology molecular biology comparative anatomy the study of the anatomy of an organism to explain evolutionary similarity arrowRight the study of similarities in embryos of organisms to find common connections arrowRight the analysis and comparison of DNA to better understand relationships between species arrowRight the study of life cycles of organisms to find common stages arrowRight
Answer:
the study of the anatomy of an organism
to explain evolutionary similarity- comparative anatomy
the study of similarities in embryos of
organisms to find common connections- embryology
the analysis and comparison of DNA to better
understand relationships between species- molecular biology
the study of life cycles of organisms to find
common stages- developmental biology
Explanation:
I got it right on the test :)
Advances in technology have revolutionized the study of evolutionary relationships between species by facilitating various scientific disciplines. Comparative anatomy involves scrutinizing the anatomical structures of organisms to decipher evolutionary connections based on shared features.
Embryology explores the developmental similarities among embryos of different species to unveil ancestral relationships and common origins. Molecular biology employs DNA analysis and comparison to unveil genetic similarities, enabling researchers to delineate intricate evolutionary lineages. Lastly, developmental biology delves into the life cycles of organisms, seeking common stages across species that offer insights into evolutionary patterns.
The correct match for each field of study to its description:
Comparative Anatomy: the study of the anatomy of an organism to explain evolutionary similarity
Embryology: the study of similarities in embryos of organisms to find common connections
Molecular Biology: the analysis and comparison of DNA to better understand relationships between species
Developmental Biology: the study of life cycles of organisms to find common stages.
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what cell structure are needed for photosynthesis and for respiration??
Answer: Chloroplast
Explanation:
Chloroplast is the organelle that is in the plant cell that uses photosynthesis and cellular respiration. I hope this helps!
Answer:
cellular respiration happen in the mitochondria. Mitochondria are the working organelles that keep the cell full of energy in a plant cell, chloroplast makes sugar during the process of photosynthesis converting light energy into chemical energy stored in glucose.
3. Which is not a particle within an atom?
Answer:
an ion
Ion is smaller then all them and doesn't belong here.
imagine you are a marine scientits. which of the following organisms would you warn people to avoid eating due to the risk of high levels of toxins in their bodies as a result of biomagnification
A. Algae
B. Phytoplankton
C. Small fish
D. Sharks mom
Eating sharks will be of maximum risk.
Option D.
Explanation:Biomagnification is a phenomenon where a toxin which is present in the environment is taken by smaller organisms and the concentration of toxins increase in concentration in higher tropic levels.
Suppose a toxin is present in sea water. It's taken by the small algae along with water which isn't metabolized by the algae, but stored in their body. Now these algae are consumed by small phytoplankton which consume a lot of algae, and the toxin present in their body, which again gets stored due to no metabolism. This even increases into smaller fishes, larger fishes and then into shark which has the maximum toxin concentration. So consumption of sharks will be of maximum health risk.
The ultimate reason governments have made stricter laws concerning refuse disposal is that
O refuse attracts vermin
refuse is unsightly
refuse breeds disease
refuse smells terrible
Answer:
The correct option is C) refuse breeds disease
Explanation:
Refuse Disposal can be described as the act of disposing or discarding waste or recycling the waste. If the waste is not discarded properly and remains on streets or in lakes, then it stimulates the growth of infectious microorganisms. A wide number of diseases can be caused due to these infectious agents. Hence, the government of a country tends to make strict loss concerning refuse disposals. These laws maintain cleanliness and proper waste disposal in the country.
refuse breeds disease
Explanation:
root vegetables, such as carrots, are classified as what type of of root system?
a. fibrous root system
b. nutritious root system
c. dermal root system
d. taproot system
Answer and Explanation:
root vegetables, such as carrots, are classified as what type of of root system? taproot system.Taproot system is one of the three major types of rooting systems found in plants including adventitious root system and fibrous root system. Taproots arise from the radicle of a germinating embryo. The radicle of many plant species dies soon after maturation and, hence, the taproot gets converted into the fibrous root system in the later stages.
Answer: d Taproot system
Explanation:
Complete the following analogy.
Nucleus is to cell as ____ is to human body.
Brain
Heart
DNA
Answer:
brain
Explanation:
the nucleus controls the cell
Nucleus is to cell as brain is to the human body. Nucleus is known as the brain of the cell as it contains all the essential genetic information of the cell. Thus, the correct option is A.
What is Nucleus?Nucleus is a cell organelle which is present in all the cells. It is present mostly in the center of the cell surrounded with the endoplasmic reticulum.
Nucleus is known as Brain of cell as it contains the genetic information of the cell which is responsible for the replication of DNA, synthesis of RNA and the synthesis of proteins which are required for various purposes.
Therefore, the correct option is A.
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the basic unit of matter is the molecule true or false?
Answer:
False.
Explanation:
The basic unit of matter is the atom.
Answer:
false
Explanation:
basic and structural unit of matter is atom
why can’t the mice population go over 400 in the hoots woods
Answer:
They might mess up everything
Explanation:
they might
Why do you think the public was more accepting of trans fat than of animal fats ?
Trans fat is cheap and can withstand multiple heating without breaking down.
Explanation:
Trans fat is made by adding hydrogen to unsaturated fats, that is hydrogen is introduced to vegetable oils .Big oil companies also spread that it is easily digestible, can be used. multiple times, etc Trans fat was cheap compared to animal fats in the market .Using trans fat instead of butter made a lot of sense to them.
identify the gland and hormone(s) affected by oophorectomy
The hormones affected by oophorectomy are estrogen and progesterone.
The gland affected by oophorectomy is the pituitary gland.
Explanation:
Oophorectomy is a procedure to remove one or both ovaries. It is done to prevent ovarian cancer or endometriosis.The ovaries make most of the body's estrogen. when ovaries are removed there will be a sudden drop in the estrogen levels. To tackle it, estrogen therapy is given.Due to the disruption of the Hypothalamus ovary connection. the Pituitary gland produces more Follicle-stimulating hormone (LSH), Luteinizing hormone (LH), Gonadotropins.Question 3 :
What is the term that correctly identifies this part of a dermal (skin) cell?
Answer and Explanation:
What is the term that correctly identifies this part of a dermal (skin) cell?
cytoplasm. The interior of a cell consists of a jelly-like substance called cytoplasm. It is here that most of the chemical reactions essential for life takes place. Within the cytoplasm are scattered several organelles.
The correct term is D. cytoplasm because it includes all the cellular material within the cell membrane, apart from the nucleus, which applies to dermal skin cells.
To determine which term correctly identifies a part of a dermal skin cell, let's consider each option:
Chromatin: This term refers to the material that makes up chromosomes, which contain the genetic code within the cell's nucleus. Since the nucleus is a part of many cells, this option is not specific to dermal cells.Cytoskeleton: This refers to the network of protein filaments that provides the cell with structure and support. While important, it is not unique to dermal skin cells.Center Vacuole: This is typically a large vacuole found in plant cells that stores water, nutrients, and waste products. Dermal skin cells in humans do not have a central vacuole, making this option incorrect.Cytoplasm: This term describes the gel-like substance inside the cell membrane that holds all cellular organelles except the nucleus. It is found in all types of cells, including dermal skin cells.Therefore, the correct answer is D. Cytoplasm because it encompasses all the cellular material excluding the nucleus within the dermal skin cell, providing a matrix where all cellular processes occur.
Complete question:
Which term correctly identifies this part of dermal skin cell
A. Chromatin
B. Cytoskeleton
C. Center Vacuole
D. Cytoplasm
polysaccharides such as starch, cellulose and glycogen are all composed of?
sucrose
glucose
fructose
Answer:
Poly-saccharines such as starch, cellulose and glycogen are all composed of glucose.
Explanation:
Polysaccharides are made of simple sugars like glucose called Monosaccharide’s . The smaller sugar are binded together by glycosidic bonds with the help of special enzymes creating a polysaccharides which is also called as glycan. Starch is polysaccharides formed by connecting glucose monomers of glucose together and is prepared from the excess of glucose produced in green plants during photosynthesis process.
Cellulose is the common materials that line along the cell wall of the pant which comprises of more than 3000 glucose units. The glycogen is the predominant form storage of glucose and carbohydrates in animals and humans. The glycogen is formed from the glucose in the food that the humans and animals consume.
A doctor diagnoses a patients liver cells as being 3 times their normal size. Describe 2 ways this would affect the function of these cells
Answer:
Enlarge liver cells may leads to a disease called hepatomegaly, is a condition where the size of liver is increased. Some times, spleen may also enlarge along with liver cells.
Explanation:
Enlarge liver can cause several symptoms like-
DiarrheaBleeding gum Disbalance in hunger.VomitingNauseaAffects the digestive tractAbnormal swellingSwollen abdomenFeverHallucinationsThis disease is mainly caused by excessive consumption of alcohol, congestive heart fatigue,liver cancer, fat in liver,disease cause by glycogen storage.
Two grizzly bears are fighting over a fish to feed themselves l. What kind of interaction is this scenario, which works as a limiting factor in a bears survival? 1.) apparent competition 2.) interference competition 3.) exploitation competition 4.) mutualism
Answer:
its interference compettion
Explanation:
Which of the following is the best description of a prediction?
O
A. Your best guess as to what will happen next in a text
O
B. Asking many questions about the different things that you are
reading
O
C. Creating a summary in your head of the reading material
O
D. Making a mental image of what is happening in the text
Apex
A prediction is a forecast based on current knowledge or evidence, and among the choices, 'Your best guess as to what will happen next in a text' is the best description. It's related to a hypothesis but more specific, often taking the form of an if-then statement in scientific contexts. The correct answer to the student's question is option (A).
The best description of a prediction from the options provided is A. Your best guess as to what will happen next in a text. A prediction is essentially a forecast based on current knowledge or evidence. It can take the form of an if-then statement, which is often used in scientific contexts, such as If the student turns on the air conditioning, then the classroom will no longer be too warm. This is because a scientific prediction generally follows the logical structure of an hypothesis testing: if the condition A is true, then result B is expected to follow. However, in the context of reading comprehension, it is more about anticipating future events or information in a text, often without a strict if-then structure.
While hypotheses and predictions are related, a hypothesis is more of an informed speculation that forms the basis of an investigation, whereas a prediction is a more specific guess that can result from a hypothesis and is typically used to suggest what the findings of the investigation will be.
D. Infrared light
5. Which electromagnetic wave produced by celestial bodies passes freely though Earth's atmosphere?
A. Ultraviolet light
Answer:
A. Ultraviolet light
Explanation:
Ultraviolet light
List and describe the four parts of a hen eggs. Where is the fat located in an egg?
A hen's egg consists of the shell, egg white or albumen, yolk, and chalaza, with the yolk containing most of the egg's fat.
Explanation:There are four main parts to a hen's egg:
The shell provides protection and is mostly made of calcium carbonate.The egg white, or albumen, contains water and proteins and serves to protect the yolk and provide additional nutrients.The yolk contains the majority of the egg's fat and is rich in proteins, fat-soluble vitamins, and essential fatty acids.The chalaza, which are cord-like structures that hold the yolk in the center of the egg white.The majority of the fat in an egg is located in the yolk.
In your own words Describe how autotrophs and heterotrophs obtain energy. please this answer must be at least 150 words any one will answer it I will mark it as brainliest.
The autotrophs are the primary producer in the food chain and they are the ones who initiate the food chain. They produce food by using sunlight or sometimes chemical energy or reactions. They primarily use carbon dioxide, sunlight and water to form sugars or carbohydrates which become their energy source. They use the process of photosynthesis or chemosynthesis to generate food. Examples of autotrophs are green plants, green algae, bacteria.
Heterotrophs cannot make their food via sunlight or other inorganic sources and hence are dependent on the autotrophs or other animals. The heterotrophs have been ranked as secondary and tertiary consumers and cannot be producers. They consume the organic products made by autotrophs to obtain energy for various metabolic and biological activities. The heterotrophs can be herbivore, carnivore, fungi, parasitic plants.
Some are photo-hetrotrophs, who use light as energy but cannot use carbon dioxide as the carbon source since they cannot fix the carbon like autotrophs.
Which is an example of a scientific hypothesis?
Answer:
When you have "if" and "then" in the assumptions
Explanation:
example: "If I give a plant an unlimited amount of sunlight, then the plant will grow to its largest possible size."
A good scientific hypothesis gives a relationship between the variables. An example will be "a certain type of mango has a gene for orange pigment, that mango will be orange coloured". This is then proved by experiments.
What is a scientific hypothesis?A defined idea whose validity or applicability can be tested using defined scientific experiments is called a scientific hypothesis. The scientific hypothesis has always undergone several processes of test and evaluation. It is always presented in such a way that it can be proven to be wrong. That means it must be falsifiable.
Science is a continuous process of using data to understand the various phenomena of the world. Nothing in the world of science can be considered absolute.
A scientific hypothesis is just a carefully worded statement of an idea that has to then undergo various experiments, and tests and face scientific argumentation in order to be proven valid.
Therefore, a good scientific hypothesis example will be "a certain type of mango has a gene for orange pigment, that mango will be orange coloured".
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Which region in the United States has the fewest thunderstorms per year
Answer: The West coast region has the fewest thunderstorms per year
Explanation: Oregon, Washington, California, Alaska and Hawaii are all examples of states in the west coast region of the United States.
The west coast region having the fewest thunderstorms is due to two main factors which are; coldness of the pacific ocean and the dryness of air in the region (Low humidity). These two conditions doesn't give room for the formation of any thunderstorm activity.
The Pacific Coast of the Pacific Northwest in the United States experiences the fewest thunderstorms per year due to its stable marine environment and the rain shadow effect created by mountain ranges.
Explanation:The region in the United States with the fewest thunderstorms per year is the Pacific Coast of the Pacific Northwest. This area generally experiences less thunderstorm activity due to its proximity to the cool waters of the Pacific Ocean and the stabilizing influence of the marine environment. While the western United States experiences a rain shadow effect due to the presence of mountain ranges, which causes arid and semi-arid lands to the east of the mountains, it is the Pacific Coast itself that is known for milder weather and less frequent thunderstorm events. Of note, areas like the Great Basin and regions east of the Sierra Nevada are also among those with less frequent thunderstorm activity due to their geographic characteristics and prevailing climatic patterns.
do guys produce sperm better in warm or cold conditions
Answer:
Apparently, cold conditions.
Explanation:
I was curious so I went and googled it and found the following: "Sperm thrive in lower temperatures. Ideally, they should only be exposed to 4° F below body temp (roughly 94°) or cooler. This means that even small sources of heat can start to add up and damage your sperm count." Quick google search would do you the same but for the sake of it, the answer is cold conditions
Answer:
warm.
because cremaster have becomes dialleted.
what caused the population of eagles to drop dramatically
Answer:
Bald eagle populations declined dramatically in the last century, attributed mostly to the accumulation of the pesticide DDT in fish, The pesticides gradually poisoned females, causing them to produce thinly-shelled eggs that broke easily, preventing the embryos from growing.
How will you prove that the food stored in leaves os starch
Answer:
To prove the food stored in leaves is starch "we will use a iodine indicator, if the leaf turn blue-black then it is confirmed that the leaf has starch. "
Explanation:
To prove the stored food in leaves is starch, first we will take a leaf, then we will treat the leaf in hot water followed by alcohol. The leaf will die when comes in contact with hot water and the alcohol will help us in the break down of the chlorophyll. Which will fade the green color. Now, we will put iodine, which we use as an indicator in the leaf, when it turn blue-black, it is confirmed that starch is present in the leaf. Sometimes the leaf will turn reddish brown, which depicts the absence of starch.
1. James Hutton developed the principle of uniformitarianism. Which
of the following statements best describes that principle?
A. It was developed based on observations of living
organisms.
B. Since Hutton was a geologist, the principle had no
influence on Darwin's work.
C. It proposed that the processes that shaped Earth in the
past no longer occur today.
D. It proposed that Earth was shaped by the same physical
processes in the past as it is in the present.
Answer:
D is the correct answer not B or c or a.
Explanation
The principle of uniformitarianism, developed by James Hutton, is best described as the concept that the same geological processes shaping Earth today have also shaped it in the past.
Explanation:James Hutton developed the principle of uniformitarianism. The statement that best describes this principle is: D. It proposed that Earth was shaped by the same physical processes in the past as it is in the present. The principle of uniformitarianism asserts that the geological processes we observe shaping the Earth today, like erosion and sedimentation, have worked in much the same way throughout Earth's history. This idea contradicts the view that the Earth's features were formed by sudden, catastrophic events that do not occur in the present. Hutton's concept strongly influenced Charles Lyell, a friend and influence on Charles Darwin, who applied the principle to his theory of evolution, suggesting that slow and gradual changes in species could occur given enough time, much like the geological processes.
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