How long have cnidarians been on earth

Answers:
The earliest animal fossils where rather modern-looking cnidarians, possibly from around 580 million years ago. They've been around for a long time!
The earliest animal fossils where rather modern-looking cnidarians, possibly from around 580 million years ago. They've been around for a long time!
They are present in fossils form since Cambrian times , and were present in Proterozoic Era .
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