Which of the following respiratory systems is not closely associated with a blood supply?
A) the lungs of a vertebrate
B) the gills of a fish
C) the tracheal system of an insect
D) the skin of an earthworm
E) the parapodia of a polychaete worm

Question

Quizplus · Accepted Answer

The tracheal system of an insect is not closely associated with a blood supply because it is a system of air tubes that deliver oxygen directly to the cells without the need for blood vessels. The other options are all respiratory systems that require a blood supply to transport oxygen and remove carbon dioxide.

Which of the Following Respiratory Systems Is Not Closely Associated