though how it evolves depends on its environment.

Some lifeforms changed a LOT in just a short time, geologically speaking, like our species. 3 million years ago we were basically upright walking chimpanzees. Others, however, don’t SEEM to have changed, but they have, just not in ways that are apparently obvious. These are changes of stabilizing selection, where deviations from the norm result in reduced fitness. Cases include roaches and crocodiles. But if you look close enough, either anatomically or physiologically, you can find they are quite distinct from their ancestors.
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