31. Invertebrates
Echinoderms
Multiple Choice
Multiple ChoiceWhat is one visible feature that makes it easy to identify sea cucumbers as echinoderms?
A
They have spines.
B
The endoskeleton is not reduced.
C
They are elongated in the oral-aboral axis.
D
They move by serpentine lashing of their arms.
E
They have five rows of tube feet.
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