SAT Subject Biology Practice Question 210: Answer and Explanation

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Question: 210

20. Within the animal lineage leading to humans, which of the following structures evolved first?

A. Bone
B. Cranium
C. Jaws
D. Notochord
E. Vertebrae

Correct Answer: D


Within chordates, the notochord evolved first and is shared, in some form, by all members of this group. In humans, the notochord evolved to form the gelatinous disks that cushion the spinal vertebrae.

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