-The complex organism fossil cast shown above first appeared in the __________ period.
A)Pre-Cambrian
B)Cambrian
C)Tertiary
D)Jurassic

Name: -The complex organism fossil cast shown above first appeared in the __________ period. A)Pre-Cambrian B)Cambrian C)Tertiary D)Jurassic
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Question

-The complex organism fossil cast shown above first appeared in the __________ period. 
A)Pre-Cambrian 
B)Cambrian 
C)Tertiary 
D)Jurassic

Quizplus · Accepted Answer

The Cambrian period is known for the "Cambrian Explosion," a time when many complex organisms first appeared in the fossil record. This period marks a significant evolutionary expansion of diverse life forms.

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