Nevertheless he imagined gradation from simple-eyed animals with pigment-coated nerves to ones with eyes of a “high stage of ...
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At Least 541 Million Years Old, These Might Be The First Animals To Evolve On Planet Earth
Animal 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 ...
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