The mouth of the brittle star is surrounded by five movable plates that serve as ___________.
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Q67: These odd little echinoderms were formerly considered
Q68: Water for filter feeding in the hemichordates
Q69: Characteristics of the hemichordates that are shared
Q70: In brittle stars,water circulates into the _
Q71: Hemichordates are marine animals that were formerly
Q73: Hemichordates do not have a kidney,but they
Q74: The larva of enteropneust hemichordates is known
Q75: The ancestor of the echinoderms had _
Q76: The _ _ was formerly thought to
Q77: The _ live in secreted tubes on
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