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

The tissues exchange `O_2//CO_2` directly with the haemocoel which then exchange with tissues.

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