Comment by gbil

I'm not a native English speaker yet I have objections with the use of "adapted" in this sentence

  The Earth had been spinning on its axis for a billion years when the first living beings appeared. Since then, we have adapted to alternate between light and darkness.

You adapt when the environment was in a state A and changes to state B while you are already there. When you start from "scratch" in a specific stable environment, you develop/grow in that environment, not adapt. Or not ?