A) Echinodermata
B) Platyhelminthes
C) Porifera
D) Mollusca
Correct Answer: C
Solution :
Members of phylum Porifera are the lowest of metazoans or multicellular animals. These are diploblastic. Organs and tissues are absent. They possess cellular level of organization. The members of phylum Platyhelminthes have definite organ system level of organization. Skeletal, respiratory and circulatory system are absent. The digestive system is incomplete and the excretory system includes characteristic flame cells. Molluscs aie triploblastic, coelomic animals with organ system level of organization and tube within a tube body plan with bilaterally symmetry. Echinoderms are exclusively marine having respiratory system (dermal branchiae) circulatory (open type) but no excretory system.
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