In order for an organism to survive what must it be able to do?

An organism must adapt to its environment in order for it to survive. This is evidenced through fossil records, from which we can tell that those organisms which did not adapt failed to pass their genes onto offspring. An example of such an adaptation might be giraffes developing long necks, so as to feed upon foliage other animals are not able to reach.

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1.fossils 2.analogous organs 3.homologous organs