The skeleton of sea urchins consists of ten sets of closely fitting plates and is called a(n)
A) test.
B) exoskeleton.
C) cuticle.
D) tunic.
E) spine.
Correct Answer:
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Q25: The echinoderms that most closely resemble fossil
Q26: Many echinoderms from this class produce toxins
Q27: Sea lilies and feather stars belong to
Q28: Basket stars and brittle stars belong to
Q29: Sea cucumbers respire using
A)large feathery oral tentacles.
B)oral
Q31: Which of the following echinoderms may contain
Q32: The madreporite in sea cucumbers is
A)absent.
B)internal.
C)external.
D)on the
Q33: If a brittle star is grasped by
Q34: The function of Aristotle's lantern is
A)protection.
B)digestion.
C)chewing.
D)locomotion.
E)regeneration.
Q35: Of the following structures found in sea
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