Which of the following respiratory systems is not closely associated with a blood supply?

Vertebrate lungs

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Fish gills

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Tracheal systems of insects

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Outer skin of earthworm

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Solution

The correct option is C Tracheal systems of insects
An insect respiratory system is a biological system with which it introduces respiratory gases to its interior & then performs gas exchange. The gases are exchanged directly between the tracheae and tissues and blood is not involved in the process.
So, the correct option is 'Tracheal systems of insects'.

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