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Q.

All the following are found in sponges, except

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a

choanocytes

b

digestive tract and extracellular digestion

c

spicules 

d

sexual and asexual reproduction 

answer is D.

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Detailed Solution

In sponges, there is no defined digestive system. The digestion is intracellular. The food enters the spongocoel through ostia and digested food is excreted out through osculum.

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