Which one of the following creatures has no blood but respires?

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(a) Hydra — Hydra does not have blood. It is a single cellular animal. In the hydra, respiration is accomplished via diffusion of molecules of oxygen and carbon dioxide through the skin whereas earthworm, cockroach and octopus has blood.

Answer

(B) Cockroach

Answer

(C) Earthworm

Answer

(D) Fish

Which one of the following creatures has no blood but respires?

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