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it was the time when most of the major groups of animals first appear in fossil record known as the cambrian explosion.
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invertebrates are dominant, Earliest fish come around and are jawless.
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Earliest terrestrial plants and animals and tiktaalik Eurupterids develop
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Armored fish go extinct , but abundance of several species of fish earliest amphibians and ammonites.
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Abundant sharks and amphibians and large swamps and coal forming forests.
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Extinction of many types of marine animals including trilobytes.
