Darwin Day - Evolution is a biological necessity

Things change; this is a fundamental principle of biology and one of the big scientific insights of the 19th century. Organisms alter their environment, and then life must change to adapt to the new conditions; living organisms must evolve or go extinct. Evolution is a necessary aspect of life; you cannot explain biology without it, unless of course you wish to deny biology a history. The back and forth interaction between changing environments and adaptation means life has a history resulting in organisms that possess a myriad of ways to succeed at making a living in the natural world. Biologists make a living explaining both.
Now if only the Phactor can get the rest of this book done.