In which of the following animal, respiration occurs without any respiratory organ?

Cockroach

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Fish

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Frog

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Earthworm

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Solution

The correct option is D Earthworm
Respiratory organs are lacking in earthworm and gaseous exchange takes place through the skin, which is richly supplied with blood vessels and has to be kept moist by excretion of coelomic fluid through the dorsal pores. Carbon dioxide also diffuses from blood to the skin from where it is eliminated.
Hence, option D is the correct answer.

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In which of the following animals, respiration occurs without any respiratory organ?

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