What period of Earth's geologic history saw a dramatic increase in life?

Name: What period of Earth's geologic history saw a dramatic increase in life?
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The Cambrian period, part of the Paleozoic Era, is known for the Cambrian Explosion, a short period of time in which there was a rapid increase in the diversity of life on Earth. This event saw the emergence of most major groups of animals and a significant increase in the complexity of ecosystems.

What Period of Earth's Geologic History Saw a Dramatic Increase