Q.

Spiracles in cockroaches are analogous to [[1]] in humans

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answer is NOSTRILS.

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Detailed Solution

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Spiracles in cockroaches are analogous to nostrils in humans.

Humans breathe in air through their nostrils and the oxygen enters their lungs and is distributed through the capillaries. Thus, the structure of man that's analogous to the spiracle of the cockroach is the nostrils.

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