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Samurai Evolution

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Uploaded by on Mar 16, 2007

Random external forces determine which genetic traits are passed on to the next generation: The essence of selection.

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  • Yes, it *is* just a crab. That's part of the point of this segment. Human selection due to human superstition bred it to look that way. It's an example of unintended artificial selection.

  • Selection is not random. Variation is random, but selection is nonrandom based on the environment.

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  • This book was so ballin.' Get yourself the illustrated version. Sagan is just a delight to read.

  • ahh there's never been anyone quite like him since. and we're the lesser for it.

  • Carl Sagan is awesome!

  • thanks for posting this!

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