Tag: geology
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Lack of oxygen may have delayed the evolution of complex critters
Earth formed about 4.5 billion years ago. Life followed around 3.8 billion years ago, apparently almost as soon as the first rocks solidified from the molten surface. However, the ancestors of all modern complex animals — insects, crustaceans, vertebrates of all descriptions — didn’t arrive on the scene until about 570 million years ago, in…
Galileo's Pendulum 