The complex organism fossil cast shown above first appeared in the __________ period.

Name: The complex organism fossil cast shown above first appeared in the __________ period.
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Question

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The Cambrian period is known for the explosion of complex animal life, so it makes sense that this fossil cast of a complex organism would appear during this time. The Pre-Cambrian period is known for simpler life forms, and the Tertiary and Jurassic periods are much later in geologic time.

The Complex Organism Fossil Cast Shown Above First Appeared in the __________