Evolutionary sequence of canal system in sponges is (A) Sycon \( \rightarrow \) Ascon \( \righta...

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Evolutionary sequence of canal system in sponges is
(A) Sycon \( \rightarrow \) Ascon \( \rightarrow \) Leucon
(B) Leucon \( \rightarrow \) Sycon \( \rightarrow \) Ascon
(C) Ascon \( \rightarrow \) Sycon \( \rightarrow \) Leucon
(D) Sycon \( \rightarrow \) Leucon \( \rightarrow \) Ascon
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