The awnser to ur question is epidermis
Answer:
We can tell that extinctions have occurred in the past by looking at fossils in layers of sediments. If the amount of fossils found match you can infer that they are the same organism and they are extinct. If you can't match up the bones with any animal today.
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Changing one amino acid in the protein hemoglobin causes sickle-cell anemia.
D. Prokaryots do not have any genetic material.
