Which among the following is not a characteristic feature of sponges? (A) They are bilaterally s...

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Which among the following is not a characteristic feature of sponges?
(A) They are bilaterally symmetrical
(B) They are the first multicellular diploblastic organisms
(C) The body wall of sponges consists of pinacoderm and choanoderm
(D) They show the presence of trophocytes which provide food to the developing cells
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