Which is characterized by an absence of jaws?Lamprey

Trout

Sea horse

Answers

Answer 1

Answer: I believe the correct answer from the choices listed above is the first option. A lamprey is characterized by an absence of jaws. This animal is have no jaws and are only full of teeth. Lampreys are any jawless fish of the order Petromyzontiformes. Hope this answers the question.

Answer 2

Answer:

The above answer is correct. Lampreys don't have jaws, possessing just cartilage.

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1. in an ecosystem with four levels—producers, primary consumers, and two higher-level consumers—describe where the decomposers operate relative to the other trophic levels. provide at least two examples of organisms at each level.

Answers

Decomposers, as the name suggests, decompose dead plants or animals into simple compounds. They feed on dead producers from the first levels or consumers from other three levels. Breaking them down, decomposers release nutrients that producers can use.
In an ecosystem with four levels, the first level are producers, such as plants and algae. On the second trophic level, there are primary consumers, herbivores that eat plants, for example, a deer, a rabbit, a grasshopper. The next trophic level belongs to secondary consumers that eat herbivores, for example, a wolf, a fox. The highest level is tertiary consumers that eat carnivores, for example, a bear, an eagle.

Is the distribution of organisms of a species constant with time?

Answers

The distribution of organisms of a species is constant with respect to time on the surface of the earth.

What is Species?

A biological species is a group of organisms that can reproduce with one another in nature and produce fertile offspring.

Organisms of a particular species evolve with respect to time. A specific organism or species does not stay the same over a period of time. But they acquired constant changes over time. They are favored by the environment to produce fertile offspring.

Therefore, the distribution of organisms of a species is constant with respect to time on the surface of the earth.

To learn more about Species, refer to the link:

brainly.com/question/25939248

Answer:

The distribution of organisms on the earth's surface is ultimately due to evolutionary change: Organisms or Species do not stay the same over time but are in a constant state of change as individuals. They are best able to live and reproduce within certain environments.

Explanation:

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Old grouth forests are full of sick, diseased and decadent trees?

Answers

That is false. An old-growth forest — also termed primary forest, virgin forest, primeval forest, late seral forest, or (in Britain) ancient woodland — is a forest that has attained great age without significant disturbance and thereby exhibits unique ecological features and might be classified as a climax community.

Isotopes of uranium are the most common fuel used in nuclear power plants. True/ False

Answers

This is true, they are a large unstable isotope that can be broken down into smaller more stable elements to release energy to power turbines and generate electricity

Answer:

True

Explanation:

Isotopes of uranium, specifically uranium-235 and uranium-238, are commonly used as nuclear fuel in power plants. When these isotopes undergo nuclear reactions, they release large amounts of energy, which can be used to generate electricity.

A common birth defect characterized by an opening between the upper lip and the nose is called:

Answers

A common birth defect characterized by an opening between the upper lip and the nose is called Cleft Lip. Cleft lip happens during the early stage of pregnancy. This occurs when there is an unsuccessful connection in the face and lip area while the fetus is developing inside the womb. Both cleft lip and cleft palate are successfully treated with surgery.

A teacher performs a demonstration of cellular transport by placing a raisin in pure water. After 24 hours, the students check the raisin and find that it has swollen and has a greater mass than before it was placed in the water.