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Respiration in insects is called direct ...

Respiration in insects is called direct because

A

The tissues exchange `O_2/ CO_2` directly with the air in the tubes

B

The tissues exchange `O_2/CO_2` directly with coelomic fluid

C

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

D

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, B, C, D
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