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How do scientists know when various kinds of plants and animals appeared?

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How do scientists know when various kinds of plants and animals appeared?

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- Scientists know when various kinds of animals and plants appeared because of fossils.  Like the plants, animals evolved in the sea. And that is where they remained for at least 600 million years. The oldest fossil evidence of multi cellular animals is burrows that appear to have been made by smooth, worm like organisms.

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https://sci.waikato.ac.nz/evolution/AnimalEvolution.shtml
https://www.britannica.com/science/fossil-record

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- history of life as documented by fossils, the remains or imprints of the organisms from earlier geological periods preserved in sedimentary rock