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What was the first animal on earth?

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It was a microscopic being, the name is not known.

Tribolites, that came into existence approximately 450 million years ago at the beginning of the Paleozoic Era in the Cambrian Period, are among the first animal-like creatures on earth.

amoeba

Earth's first animal was the ocean-drifting comb jelly. I know it is hard to belive but the scientists just discovered it on April 2008.
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