Sea urchins and jellyfish are both radially symmetrical, but sea urchins and humans are much more closely related than sea urchins and jellyfish. Why is this true?
A. Sea urchins have bilaterally symmetrical larvae and exhibit radial cleavage.
B. Humans are descendents of sea urchins not jellyfish.
C. Jellyfish have bilaterally symmetrical, triploblastic larvae.
D. Humans are radially symmetrical during most of their embryonic development.
Answer: A
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