Not all sponges have skeletons. If they do, their skeletons may be made of:
A) silica.
B) calcium carbonate.
C) bone.
D) protein.
E) carbohydrate.
Correct Answer:
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Q39: Comb-jellies, or ctenophores, are similar to cnidarians
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A)sponges.
B)jellyfish.
C)corals.
D)placozoans.
E)comb-jellies.
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