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Respiration in insects Is called direct ...

Respiration in insects Is called direct because

A

the tissue exchange `O_(2)//CO_2` directly with the air in the tracheal tubes

B

the tissue exchange `O_2//CO_2` directly with the coelomic fluid

C

the tissues exchange `O_2//CO_2` directly with the air outside through the body surface

D

the tracheal tubes exchange `O_(2)//CO_(2)` directly with the haemocoel which then exchange with tissues

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The correct Answer is:
A
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