An identikit picture of the small furry ancestor that gave rise to humans and most other mammals has been pieced together by scientists. The shrew-like creature weighed less than half a pound, had a long tail, and ate insects. It evolved some 200,000 years after a massive asteroid impact led to the extinction of the dinosaurs 65 million years ago. From this small beginning sprang every “placental” mammal that gives birth to mature live young, including dogs, cats, rodents, whales and humans….
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