Which of the following is not true about echinoderms? (A) An excretory system is absent (B) Sexe...

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Which of the following is not true about echinoderms?
(A) An excretory system is absent
(B) Sexes are separate and reproduction is sexual
(C) Development is indirect with free-swimming larva
(D) Mouth is present on the upper (dorsal) side and anus on the lower (ventral) side
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