At Least 541 Million Years Old, These Might Be The First Animals To Evolve On Planet EarthAnimal life is a recent addition to Earth, relatively speaking. The planet formed about 4.5 billion years ago, with microbial life likely emerging between 4.3 and 3.7 billion years ago. It was not until several billion years later that animals started to rock up in a humble and vaguely familiar form:...
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