“Why Sex” (Part 5 of seven) examines one major biological imperative. “From an evolutionary perspective, sex is more important than life itself,” says narrator Liam Neeson. That's apparent in a segment comparing cloned Mexican minnows and their sexually reproduced cousins (although cloned Texas lizards do just fine). The hour also looks at why peacocks' feathers are important (it might be the same reason why Bach composed his concerti); why some creatures remain monogamous (to the extent they do).; and why humans adopt children.
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