AP Environmental Science MCQ AP Environmental Science Chapter 5 Based on the diagram, which structure would be considered the most primitive?

Based on the diagram, which structure would be considered the most primitive?

Naim 03:05 AP Environmental Science Chapter 5

Based on the diagram, which structure would be considered the most primitive?

A. notochord

B. vertebrae

C. hinged jaw

D. 4 legs

E. mammary glands

Answer: A

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