The answer is B
The phylum Nematoda (roundworms) is one of the most common phyla.
There more than 15,000 known species of roundworms, however, there are many thousands of individual varieties nematodes, as well.
The study of animals is called zoology.
The correct answer to the question is option B which is Echinodermata – bilateral symmetry as a larva, water vascular system.
What is bilateral symmetry?When a species has two equal halves when it cut through the specific plane is called bilateral symmetry.According to the question, the Echinodermata has bilateral symmetry and consists of a water vascular system that helps to move in any direction.
An example of the Echinodermata is starfish.
Hence, the correct answer to the question is option B.
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CO2 enters and O2 escapes from a leaf via.
A) stomata.
B) grana.
C) thylakoids.
D) stroma.
Answer is A, stomata.
The correct answer is stomata. These are tiny openings in the leaves that allow for the intake of CO2 for photosynthesis and the release of O2, the byproduct of the process.
Explanation:The correct answer to this question is A) stomata. Stomata are tiny openings or pores found on the surface of leaves that control gas exchange. They allow the carbon dioxide (CO2) to enter into the leaf, which is a necessary component for photosynthesis, and permit the escape of oxygen (O2), a byproduct of photosynthesis. Options B) grana, C) thylakoids, and D) stroma are all components of a leaf's chloroplasts and are involved in photosynthesis, but not in gas exchange directly.
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A biology student is investigating tropisms in plants. The student observes the response of the roots of radish seedlings to a light source placed to the right of the roots. All of the roots grow away from the light source. Which of the following tropisms is the student MOST LIKELY investigating?
gravitropism
thigmotropism
hydrotropism
phototropism
Answer:
phototropism
Explanation:
The student was investigating phototropism.
The student wanted to know the response of the roots to light, that is why he exposed them to light.
Roots naturally exhibit two types of tropisms.
The first is gravitropism whereby they tend to grow downwards.
The second is hydrotropism whereby they grow towards the direction of water.
In the above experiment, no water was provided, the roots grew away from the light source but not specifically downwards.
Folds of the small intestinal mucosa are known as
The Micro Villi... They help push waste down the intestines.
Most populations on earth are affected by several factors such as a genetic drift mutations and natural selection which statement applies to a population that is experiencing changes in gene frequencies
Evolution is occurring in the population
Mutations will not affect the population
Lethal gene will eventually be expressed
The hardy-weinberg equilibrium is being maintained
The answer is; Evolution is occurring in the population
When the gene frequency is changing in a population it means some gene alleles are being slowly eliminated from successive generations and the other is being favored. This means that one allele is giving an advantage in the environment while the other is offering a disadvantage. This is natural selection, which powers evolution., in progress.
The statement applies to a population that is experiencing changes in gene frequencies - evolution is occurring in the population
EvolutionIt is the change in the characteristics of a species over several generations and relies on the process of natural selection, genetic drift, mutation. It is a very long process that takes several generations.
In this process, only beneficial traits are accumulated while harmful traits or genes are eliminated from the population. As there are changes that take place so these can not follow the hardy-Weinberg equilibrium.
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Classify Is blood classified as a cell, a tissue, an organ, or an organ system? Explain the classification.
its a cell because blood is made from red blood cells
What prediction can you make about the impact of these threats on the resident populations versus the transient populations?
The resident populations are more likely affected by these threats because of their proximity to shore.
The resident populations and the transient populations are likely to be equally affected by these threats.
The transient populations are more likely affected by these threats because of their distance from shore.
Neither the resident populations nor the transient populations are likely to be affected by these threats in the future.
Answer: A) The resident populations are more likely affected by these threats because of their proximity to shore.
Explanation:
All of these threats are higher in coastal regions.
As contaminants usually reach the ocean through rivers or because of coastal cities, the highest degree of pollution is there. All chemicals will accumulate in this region first, before they disperse into the offshore region. This is also caused by the fact that the coastal waters have a lower volume and surface area than the offshore which results in a higher degree of contamination.
An organism that feeds on the body fluids or tissues of another organism, but does not kill it, is called a ____
It’s call a predator
Answer:
It's a parasite, that other comment is so wrong.
Explanation:
According to the BiomeViewer, Mt St Helens/Spirit Lake is in a __________ biome
Temperate Coniferous Forest
Temperate Deciduous Forest
Boreal Forest
Tundra
The answer is Temperate Coniferous Forest. Hope this helps!
Answer:
Mt St Helen’s Lake is an example of Temperate Coniferous Forest.
So correct answer is option A.
Explanation:
It is located in Washington DC in USA. The Mt St Helen’s Lake is also called Spirit lake. It is actually a volcanic lake, formed on the crater of Mt St Helen. It is situated in the temperate region. So the vegetation is of temperate region.
Being a mountainous region, there’s no deciduous trees. Whereas, conifers occupy the region, leading to a temperate coniferous vegetation.
If each parent can produce 100 genetically distinct gametes, how many genetically distinct offspring can two parents produce?
a. 10,000
b. 1,000
c. 200
d. 100
Each parent can do D. 100
The total number of genetically distinct offspring that two parents can produce, each capable of producing 100 distinct gametes, is 10,000 (100 from one parent times 100 from the other parent).
Explanation:In biology, when two parents each produce 100 genetically distinct gametes, they can potentially produce 10,000 genetically distinct offspring. This is because each of the 100 sperm from the male parent can combine with each of the 100 eggs from the female parent. In terms of genetic combinations, we consider the possible pairings, which are calculated by multiplying the number of possibilities from each parent. Therefore, the answer is 100 (from one parent) times 100 (from the other parent), equaling 10,000 genetically distinct offspring.
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Which one of the following most closely approximates the number of replicons in a human focus of replication?a. 1b. 50c. 100d. 300e. 30 000
The answer is:
E. 30,000
Since a replicon is known as the amount of DNA which is replicated from a single ori. Since bacteria only have one ori, they only have one replicon. The human genome has approximately 30,000 ori, so there will also be 30,000 replicons in a human focus.
Respiration is a process during which energy is released from glucose. This energy is used for processes such as growth of the body.
the answer is
photosynthesis
If a rifleman's gunsight is adjusted incorrectly, he might shoot bullets consistently close to 2 feet left of the bull's-eye target. draw a sketch of the target with the bullet holes. does this show lack of precision or bias?
b. draw a second sketch of the target if the shots are both unbiased and precise (have little variation). the rifleman's aim is not perfect, so your sketches should show more than one bullethole.
Not going to draw it since i'm horrible at drawing but it's pretty simple. The shots that are consistently 2 feet left means his aim is fine but his sites are off. It shows no lack of precision.
The second one is pretty simple aswell. every rifleman can't shoot the same hole every single shot. Many things affect it but the same technique the same time for every shot with "zero'd" sights means the rounds should be inpacting within a relativly small shot group.
A potassium-40 sample starts with 50 atoms, and 1.25 billion years later, there are 25 atoms. What is the half life of potassium-40?
A. 25 years
B. 40 years
C. 1.25 years
D. 2.5 years
Potassium-40 has a half life of 1.25 billion years.
Explanation;New amount = Original amount × (1/2)^n ; where n is the number of half lives.
Original amount is 50 atoms
New amount is 25 atoms
Therefore;
25 = 50 × (1/2)^n
1/2 = (1/2)^n
Thus; n = 1
n = 1 which is equivalent to 1.25 billion years
Therefore;
Potassium-40 has a half life of 1.25 billion years.
Answer:
C
Explanation:
Depends on organisms passing genes to the next generation. Why do organisms resemble those from long ago?
Evolution takes a very long time and so the genes won't be completely different
which of these is an example of climate?
A. last month's total rainfall
B. a weather forecast
C. the current temperature
D. An annual weather pattern
The answer to the question is D. An annual weather pattern.
The question, "Which of these is an example of climate?" involves understanding the difference between climate and weather. Climate refers to the long-term, predictable atmospheric conditions of a specific area, while weather pertains to atmospheric conditions over a short period. Therefore, the correct answer is D. An annual weather pattern, as it encompasses the long-term averages of weather in a specific location, which is indicative of climate. Last month's total rainfall or a specific day's temperature are examples of weather events, not climate. Similarly, a weather forecast predicts short-term atmospheric conditions and is also not an example of climate.
In the fruit fly Drosophila, there is a dominant gene for normal wing shape and its recessive allele for dumpy wings. At another gene locus on the same chromosome, there is a dominant gene for tan body color and its recessive allele for ebony body color. A male that is homozygous for both dominant alleles is crossed with a female that is homozygous for both recessive alleles. What percentage of the F1 flies are expected to be heterozygous at both gene loci? ( Enter the number only without the percent sign. For example, enter 100% as 100 and enter 12.5% as 12.5 )
If we name the gene for wing shape with A
Genotype for the normal wing shape would be either AA or Aa and recessive genotype for dumpy wings would be aa. If we name the other gene for body color with B, then
genotype for tan body color would be BB or Bb and for ebony body color bb.
If we cross a male homozygous for both dominant alleles with a female homozygous for both recessive alleles:
P: AABB x aabb
F1: AaBb
All of the offspring would be heterozygous at both gene loci.
So, the answer is 100.
A relationship in which one species benefits and the other name for benefits nor is harmed is
the relationship is called commensalism. it is a relationship in which the one organism benefits and the other is nor harmed and nor benefited. contrary to this there exist a relationship called parasitism where the parasite benefits from the organism and the host is damaged.
Placing an object in a known amount of water, the quantity of the water that rises helps you find the volume by ____.
The volume of an object submerged in water can be determined by how much water it displaces, also known as the water displacement method. This principle is often used in physics to measure the volume of irregularly shaped objects.
Explanation:Placing an object in a known amount of water, the quantity of the water that rises helps you find the volume by displacing the water. This method, known as the water displacement method, is often used in physics to determine the volume of an irregularly shaped object.
To use this method, you place the object in a graduated cylinder partially filled with water. The water level rises when you insert the object since it displaces its own volume of water. The increase in water level corresponds to the volume of the object. This is based on the fundamental principle that the volume of liquid displaced when an object is submerged in it, equals the volume of the object that is submerged.
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Which bone is considered the longest bone in the human body?
The femur is the answer you are looking for.
He reaction involved in cellular respiration is similar to that involved in the burning of fossil fuels. What must be an essential component of fossil fuels? A) oxygen B) water C) carbon D) carbon dioxide
Answer:
Explanation:
The answer is A oxygen is what must be an essential component of fossil fuels
Which of the following muscles is voluntary
muscles in your arm, give brainliest if right
Voluntary muscles, such as skeletal muscles, are those that can be consciously controlled by an individual. Cardiac muscles, which are often mistakenly thought to be voluntary, are actually involuntary and operate automatically. Skeletal muscle movement includes both conscious actions and involuntary reflexes.
Explanation:Understanding Voluntary MusclesThe muscles that can be controlled by an individual's will are known as voluntary muscles. An example of a voluntary muscle is the skeletal muscle, which is attached to the skeleton and enables movement of the body. These muscles are under conscious control, meaning that we can decide when to move them. For instance, you can choose to lift your hand or walk. However, skeletal muscles can also contract involuntarily in response to reflex actions, such as withdrawing your hand when you touch something hot.
It's important to correct a common misconception: while cardiac muscles, found in the heart, are also muscle tissue, they are not voluntary but rather involuntary muscles which cannot be consciously controlled.
Involuntary muscles, including both cardiac and smooth muscles, operate automatically without conscious thought. They perform critical functions like pumping blood through the heart and moving food through the digestive system.
Reactions that require CO2 take place in _____.
A. neither the light reactions nor the Calvin cycle
B. the chloroplast, but not as part of photosynthesis
C. both the light reactions and the Calvin cycle
D. the Calvin cycle alone
E. the light reactions alone
Reactions that require carbon dioxide take place in the calvin cycle alone
Answer: Option D
Explanation:
Calvin cycle is an important cycle that plays a major role in the synthesis of starch through the photosynthesis. Calvin takes place as a part of the dark reaction in the stroma.
It is the calvin cycle that requires carbon dioxide. It uses the ATP that are produced by the light reaction that takes place in the thylakoid with the help of chlorophyll that traps the sunlight.
Reactions that require CO2 take place in the Calvin cycle alone. The Calvin cycle, part of the photosynthesis process, utilizes the ATP and NADPH produced in the light reactions along with CO2 from the air to produce glucose.
Explanation:The correct answer is D, the reactions that require CO2 take place in the Calvin cycle alone. Photosynthesis, a biological process in plants, is divided into two stages: the light reactions and the Calvin cycle. The light reactions occur in the thylakoid membranes of the chloroplast and essentially convert light energy into chemical energy in the form of ATP and NADPH.
In contrast, the Calvin cycle, which occurs in the stroma of the chloroplast, uses the ATP and NADPH produced in the light reactions along with CO2 from the air to produce glucose, a form of sugar that the plant can use for growth and to supply the plant's energy needs. To perform these processes, CO2 is necessary in the Calvin cycle for the synthesis of glucose.
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Which of the following has the MOST similarity in nucleotide sequence?A. sister chromatidsB. complementary strands of DNAC. homologous chromosomesD. nonhomologous chromosomesE. maternal and paternal copies of the same chromosome
B because you can get DNA from people
Which of the following mutations could lead to constitutive expression of the genes of the lac operon?
A mutation in the lac-Z gene
A super repressor mutation
A mutation in the operator sequence
A mutation in the lac-Y gene
the answer is A.
~hope this helped
Which of the following is not a characteristic shared by all chordates?
fins
hollow nerve chord
pharyngeal pouches
notochord
Fins
Fins are not a characteristic of all chordates
Explanation;All Chordates share four key features, which includes; a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post tail.The notochord provides skeletal support, gives the phylum its name, and develops into the vertebral column in vertebrates. The dorsal hollow nerve cord develops into the central nervous system: the brain and spine. Pharyngeal slits are openings in the pharynx that develop into gill arches in bony fish and into the jaw and inner ear in terrestrial animals. The post tail is a skeletal extension of the posterior end of the body, being absent in humans and apes, although present during embryonic development.The characteristic that is not shared by all chordates is 'fins'. While fins are seen in certain subgroups of chordates, not all chordates possess them. The three main features common to all chordates are a hollow nerve chord, pharyngeal pouches, and a notochord.
Explanation:The characteristic that is not shared by all chordates is fins. The chordates, which include vertebrates, have three main defining features: a hollow nerve chord, pharyngeal pouches, and a notochord. However, not all chordates have fins. For instance, chordates like mammals and birds do not possess fins, but they do have the other three common features.
Fins are typically seen in aquatic or semi-aquatic species such as fish, but they are not a necessity for all chordates. Fins are used for movement, balance, and steering in an aquatic environment, but they are not a feature shared universally by chordates. Thus, while fins are common in certain subgroups of chordates, they are not a characteristic shared by all.
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All plant and animal groups existing together and the physical factors with which they interact compose a(n)
a.climate.
b.kingdom.
c.ecosystem.
d.weather pattern.
Ecosystem. it is defined as a biological community of interacting organism and their physical environment.
A trait has two alleles, p and q. If 20% of the alleles in a population are type p, what percent are type q? (enter number only, no % sign)
q = 80 percent
Explanation;If a trait has two alleles, p and q, and p is 20% then we can find the percent of q.
According to the Hardy-Weinberg equilibrium;
p+q = 1
Therefore;
q = 1 - p
but; p = 20% or 0.2
Thus; q = 1 - 0.2
= 0.8
The percent of q is 80%
After reading the paragraph, answer the question(s) that follow.
Brittany's family includes several individuals with a genetic disorder that affects primarily males. Her husband Tony has no history of the disease to pass on to their children. They've decided that their best chance to have a healthy family is to have only daughters. Through a new type of assisted reproductive technology, it's possible to separate sperm that will produce sons from those that will produce daughters. Brittany's eggs will be fertilized by in vitro fertilization (IVF) with sperm that can produce only daughters. The developing female embryo can be implanted into her uterus to complete development normally.
The daughter-producing sperm used to fertilize Brittany's eggs should be
A. diploid primary spermatocytes.
B. haploid secondary spermatocytes.
C. diploid sperm cells.
D. haploid sperm cells.
Answer:
D. haploid sperm cells.
Explanation:
Haploid cell is cell that contains a single set of chromosome. In the example above, haploid sperm cell will only contain X chromosome. An X chromosome from the father will combine with the mother’s X chromosome to make a daughter (XX) (Y chromosome will combine with the mother’s to make a boy (XY)).
1. What is the name for the process in which DNA→RNA
A Translation
B Transcription
C Replication
2. a group of zebras would be
A Community
B Ecosystem
C Population
3. Which enzyme is used in DNA replication
A Lactase
B Helicase
C RNA polymerase
4. Which biome would have the greatest biodiversity
A Desert
B Temperature forest
C Tundra
5. Which statement best describes a food chain
A Interconnected relationship of an ecosystem
B Relationships of predator and prey
C Pathway through which energy moves through ecosystem.
1. The answer is; B
Transcription is part of the central dogma. It is conducted by the RNA polymerase enzyme that adds complementary bases too, the DNA is transcribed, on growing RNA strand. The RNA is processed (such as splicing) and the mRNA is then used to produced proteins in the process of translation conducted by ribosomes.
2. The answer is; C
Pollution is made up of individuals of the same species, while the community is made of an amalgamation of different species that interact. An ecosystem is composed of a community and its interaction with the biotic and abiotic factors in the environment and habitat.
3. The answer is; B
Helicases are important enzymes in DNA replication because they unzip the DNA strand and allow for the DNA polymerase to access the single strands and replicate the DNA. They use the energy from ATP to break the hydrogen bonds between the two strands.
4. The answer is; B
The climate in the temperate forest is ideal for most life because they receive rainfall throughout the year while the temperatures also remain at a small optimum range throughout the year. This is capable of supporting a wide variety of vegetation and hence also support a large variety of animals.
5. The answer is; C
Many food chains interconnected together make up a food web. A food chain begins with primary producers which are mainly photosynthetic plants. These plant harness the energy of the sun into biomass. The transfer of this energy and biomass occur mainly through interactions such as predation. Primary producers are consumed by primary consumers that are consumed by secondary consumers that are consumed by tertiary consumers.
which characteristic do plants, people and flatworms share?
A). They exchange gases with the environment
B). They all have digestive systems that break down food
C). They all undergo photosynthesis
D). They all use a muscular system for movement
Answer: Option A
Explanation: Plants, flatworm and people share the similar characteristics as they exchange gases with the environment.
The exchange of gases from the environment takes place differently in different types of organisms.
In case of flatworm it takes place through its skin, plants exchange gases through their leaves and animals respire through lungs.
The common character shared by all the three organism is exchange of gases.