Fossil steroid and molecular clock evidence suggests that animals originated a. between
Chapter 27, Problem 2(choose chapter or problem)
Fossil steroid and molecular clock evidence suggests that animals originated a. between 770 and 710 million years ago. b. more than 100 million years before the oldest known fossils of large animals. c. during the Cambrian explosion. d. after sponges diverged from other metazoans. e. both a and b
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