Which group underwent a large increase in diversity during the Cambrian explosion?

Name: Which group underwent a large increase in diversity during the Cambrian explosion?
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The Cambrian explosion was a period of rapid diversification of animal life around 540 million years ago, during which many new phyla (major groups of animals) appeared in the fossil record. Plants, fungi, and bacteria did not undergo significant diversification during this time.

Which Group Underwent a Large Increase in Diversity During the Cambrian