Evolution in a Nutshell

Taken from Carl Sagan's documentary - Cosmos.
This YouTube clip uses a very simple animation which helps you to visualize and understand the very simple, yet complex nature of evolution. Organisms evolve to adapt to their environment. When you consider the scope, length and breadth in which evolution works, it all makes sense. We're always evolving, always changing, nothing stays the same. Tomorrow, we and the world around us will be different.

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Carl Sagan