The earliest known animal? — Why Evolution Is True

The Ediacaran fauna, a group of extinct species that lived between 571 and 541 million years ago, has been an evolutionary anomaly. Its fossil record contains multicellular organisms, but they are just plain weird, bearing little resemblance to present-day metazoan (multicellular) animals. The two species of “dickinsoniids” shown below, for example, lack a mouth or […]

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