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Big Ideas
Big Idea I
Big Idea II
Big Idea III
Big Idea IV
Big Idea V
Bivalve Introduction
Why Study Evolution?
How the Theory Developed
How Evolution Works
The Evidence for Evolution
Evolution in Everyday Life
Suggested Classroom Activities
Glossary
Downloads
Resources
Acknowledgments
Big Idea III
Big Idea III: Evolution by natural selection is key to understanding life on Earth.