A) Excretion and located in the body of flat worms
B) Outgoing water current an located at summit of sponges
C) Incomming water current and located in body wall of sponge
D) Sweat and located in mammalian skin
Correct Answer: C
Solution :
Each porocyte probably forms by differentiation of a pinacocyte in the pinacoderm and it is regulate incomming water current by contraction.
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