Season 1, Episode 3 The Evolutionary Arms Race; Why Sex?
First Aired: September 26, 2001
Part 3 (of four) explores the biological forces at work in “the evolutionary arms race,” and why sex is “more important than life itself,” according to narrator Liam Neeson. First: “the deadly dance of predator and prey.” Preying on humans: microbes, seen causing a drug-resistant strain of TB among Russian prisoners. “The more drugs we launch at microbes,” says Neeson, “the more resistance they evolve.” As for sex's importance, it's seen in a segment in which sexually reproduced Mexican minnows thrive while their cloned cousins struggle. This hour also explores the value of peacock feathers; why some creatures remain monogamous (to the extent they do); and why humans adopt children.
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