Scientists Have Found Earliest Known Animal.

Scientists have used fat molecules to solve a longstanding mystery and identify an ancient creature as one of the earliest animals on the planet.

For more than 75 years, researchers have struggled to classify the Dickinsonia, a peculiar, vaguely jellyfish-like creature that lived about ... read more558 million years ago. The flat, squishy, oval-shaped organism had multiple rib-like segments and could grow to over four feet long, according to National Geographic.

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