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The First Multicellular Life
The earliest multicellular life is believed to be about 2 billion years old. We think today that they were the ancestors of molluscs, jelly fish, corals and worms. While all this was happening in the sea, the land was essentially empty of life. It was populated only by lichens, bacterial mats and algae. Then about 540 million years ago, the fossil record shows a dramatic explosion of complex life with hard parts to there bodies. This period is called the Cambrian. And all of this change happened we think in as little as 10 million years.
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