Animals devoid of respiratory, excretory and circulatory organs belong to phylum

Echinodermata

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Platyhelminthes

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Porifera

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Mollusca

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Solution

The correct option is B Porifera
Porifera is the aquatic organism and has a cellular level of organisation. Its body surface has thousands of tiny pores and water canal system which allows circulation of water. It does not consist any specialised organ for respiration, excretion, and circulation. All the work is done by the cells only.
So, the correct answer is option C.

Suggest Corrections

Phylum	Level of organization	Symmetry	Coelom	Segmentation	Circulatory system	Digestive system	Respiratory system
???	Organ system	Bilateral	Coelomate	Present	Present	Complete	Absent