Biology / Bio 2235 · Atom · ~20 seconds
The Cambrian Explosion
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The Cambrian explosion names a rapid diversification, beginning roughly 542 million years ago, when most animal body plans appear in the fossil record.
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Cambrian-period fossil sites preserve early arthropod, mollusk, and chordate body plans within a narrow span of time.
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"Rapid" here spans millions of years, not instant — the term describes a burst against the longer spans around it.