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Read the following statements.
(a) Calcareous spicules constitute the skeleton of some of the sponges.
(b) All cnidarians are exclusively marine.
(c) Bioluminiscence is well-marked in ctenophores.
(d) All flatworms absorb nutrients from the host directly through their body surface.
In the above, the incorrect statements are

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a and b

b and c

b and d

a, b and d

answer is C.

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Detailed Solution

Some cnidarians like Hydra are fresh water species. Some flatworms (tapeworms) absorb nutrients from the host directly through their body surface. Others (flukes and planarians) have an incomplete gut with a single opening, the mouth.

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