In evolutionary terms, a "successful" organism is one that passes on its genes -- not necessarily one that lives a long life.
Point at a ball and a dog will look at the ball, whereas a cat will probably look at your hand. Dogs seem to have a ready understanding of how human beings direct attention by pointing, and can follow our gestures almost as if they thought the same way we do. Of course, dogs probably [...]
In this instance, nature is said to have “selected” the camouflaged butterfly over other variations that weren’t as well hidden. In “artificial selection,” the same thing happens, only we human beings make the choices.
By examining the weather patterns and the currents, Censky has shown that the new iguanas must have spent about three weeks at sea before bumping up on the island.