A) Protozoa
B) Annelida
C) Porifera
D) Cnidaria
Correct Answer: C
Solution :
Sponges are the basalmost clade of animals of the phylum Porifera. They are multicellular parazoan organisms that have bodies full of pores and channels allowing water to circulate through them. Sponges do not have nervous, digestive or circulatory systems.
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