Example: certain species of fish may change from male to female during their life.

The world need not be wiped clean of life, but a good many species would die or change, including the most complex.

This is illustrated through a computer game that shows how a species might change in response to the environment.

Some species also change colour over the course of the day.

Maybe the species has actually changed since she was born!

Throughout the game, the player's perspective and species change dramatically.

The new emphasis was on determining how a species could change over time.

We've moved further up the beach and the species has changed!