Unlike sea stars,in ophiuroids,the tube feet are extended by
A) contraction of muscles at their bases.
B) ampullae forcing water into the feet.
C) hydrostatic pressure.
D) contraction of their suction disks.
E) contraction of lateral canals.
Correct Answer:
Verified
Q16: In Asteroidea the _ system consists of
Q17: In the sea stars,a(n)_ groove runs along
Q18: Embryologically,the echinoderm water vascular system originates as
Q19: When feeding on a bivalve,a sea star
Q20: The name Echinodermata translates as
A)spiny skin.
B)spiny skeleton.
C)spiny
Q22: The characteristic larval stage of brittle stars
Q23: Echinoderms from this class have been over
Q24: The characteristic larva of the echinoids is
Q25: The echinoderms that most closely resemble fossil
Q26: Many echinoderms from this class produce toxins
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