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__________ function in cleaning the body surface of many echinoderms.


A) Ambulacrae
B) Dermal branchiae
C) The madreporites
D) Pedicellariae
E) Cuverian tubules

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The nervous system of enteropneusts is __________ in origin.


A) enterocoelous
B) ectodermal
C) mesodermal
D) endodermal
E) schizocoelous

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