Respiration in insects is called direct because
A. The tissues exchange directly with the air in the tubes
B. The tissues exchange directly with coelomic fluid
C. The tissues exchange directly with the air outside through body surface
D. Tracheal tubes exchange directly with the haemocoel which then exchange with tissues
Answer:D
Respiration in insects is called direct because
A. The tissues exchange directly with the air in the tubes B. The tissues exchange directly with coelomic fluid C. The tissues exchange directly with the air outside through body surface D. Tracheal tubes exchange directly with the haemocoel which then exchange with tissues