Narwhal tusks? Pangolin scales? Giraffe Weevil necks? Joe Hanson of It’s Okay To Be Smart celebrates the diversity of life with 12 days of videos dedicated to explaining evolution and natural selection. Above: What is evolution, anyway?

From Berkeley’s Understanding Evolution, which includes teaching materials:

Biological evolution, simply put, is descent with modification. This definition encompasses small-scale evolution (changes in gene frequency in a population from one generation to the next) and large-scale evolution (the descent of different species from a common ancestor over many generations)…

The central ideas of evolution are that life has a history — it has changed over time — and that different species share common ancestors.

Watch It’s Okay To Be Smart’s entire series, including 2. Is Evolution Random? 3. Have We Ever Seen Evolution Happen? 4. Can Evolution Make an Eye? and 5. Have We Ever Seen A New Species Arise?

More here. Plus, there are more evolution videos on this site.

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