The collar of a choanocyte
A) regulates the diameter of the osculum.
B) filters food from the water.
C) creates currents in the water.
D) regulates the diameter of the ostia.
E) secretes digestive enzymes.
Correct Answer:
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Q13: Eggs and sperm of sponges are commonly
Q14: The single large opening at the top
Q15: Gemmules contain masses of _ which can
Q16: One proposed mechanism for the evolution of
Q17: Contractile pinacocytes that can regulate water circulation
Q19: The unique adhesive cells of ctenophores are
A)statoblasts.
B)cnidoblasts.
C)colloblasts.
D)pleuroblasts.
E)statoliths.
Q20: Freshwater (and some marine)sponges form resistant structures
Q21: Members of this cnidarian class include the
Q22: Nerve cells of animals in this phylum
Q23: The _ body form of a cnidarian
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