Answer:
A disease model is an animal or cells displaying of the pathological process that are observed in the actual human or animal disease.
No organism is always the first step, except in a wide sense, plants. In the water, plankton is found in first but whereas on land, plants or seeds are eaten first.
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The answer is alveoli, there the only structures.
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The first one is atoms cause they are all the same type of particles. The blue one is the molecules that is not compound cause they aren't connected to each other. The other two are compound cause two atoms of two different elements are bonded together.
