65 million years ago, a massive asteroid slammed into the Yucatan peninsula, creating a giant dust cloud that contributed to the extinction of terrestrial dinosaurs. In the resulting re-adjustment of global ecosystems, a new plant tissue evolved, which paved the way for the eventual appearance of humans: fruit. Fruit represents a finely crafted symbiosis between plants and animals, in which the plant provides a nourishing morsel, and the animal disperses the plant's seeds inside a packet of rich fertilizer.
Fruit was such a powerful selective pressure that mammals quickly evolved to exploit it more effectively, developing adaptations for life in the forest canopy. One result of this was the rapid emergence of primates, carrying physical, digestive and metabolic adaptations for the acquisition and consumption of fruit and leaves. Primates also continued eating insects, a vestige of our early mammalian heritage.
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