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PBS Evolution, Episode 5
Why Sex?

One of the most important engines of evolutionary change is sexual reproduction. Most organisms on Earth reproduce sexually, in spite of the time and effort involved in finding a suitable mate. Sexual selection is the root cause behind much of the extravagence seen in nature, particularly with birds, and may even have played a role in the development of certain aspects of human behavior.

Key Concepts: Asexual reproduction, sexual reproduction, clones, sexual selection, evolutionary psychology, behavioral adaptations.

Answer Key: Available at the biology instructor resources subscription page.

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