1.

Respiration in insects Is called direct becauseA. The tissues exchange `O_(2)//CO_(2)` directly with the air in the tubesB. The tissues exchange `O_(2)//CO_(2)` directly with coelomic fluidC. The tissues exchange `O_(2)//CO_(2)` directly with the air outside through body surfaceD. Tracheal tubes exchange `O_(2)//CO_(2)` directly with the haemocoel which then exchange with tissues

Answer» Correct Answer - d


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