1 and 5: radial symmetry, display pentamerism arranged in a central axis
Which two of the following animals are most closely related to each other?
a. 1 and 4
b. 1 and 5
c. 2 and 3
d. 3 and 5
e. 2 and 4
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What scientific concept do you need to know in order to solve this problem?
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