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Question : Respiration in insects is called direct because

Answer»

The tissues exchange `O_2/ CO_2` DIRECTLY with the air in the tubes
The tissues exchange `O_2/CO_2` directly with coelomic fluid
The tissues exchange `O_2/CO_2` directly with the air OUTSIDE through body surface
Tracheal tubes exchange `O_2/CO_2` directly with the haemocoel which then exchange with tissues

Answer :A::B::C::D


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