Answer :<em> That trough time, a specie of animal, plant, bacteria can change.
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<em>When a life form reproduces, one of its"babies" may be different from its parents because of genetic mutation. </em>
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For your answer, I am sure your blank is "analyze". This is because you must analyze or "look over" your data that has been collected.
I think, materials collided due to strong gravitational forces..