When did animals first appear on the earth?
Question asked by: knowitall
There has been life on earth in microbial form for billions of years.
However, there were no plants or animals as we are familiar with today until relatively recently - the last 550 million years.
Marine invertebrates appeared first, then fish, amphibians, reptiles, birds, mammals and humanity. Land plant communities also evolved from relatively ancient clubmosses, horsetails and ferns, to the more recent gymnosperms (for example, conifers) and angiosperms (flowering plants).
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