Home Biology Breathing and Exchange of Gases General External gills, tracheae, and lungs all shar…
Biology Breathing and Exchange of Gases General Single Correct MCQ
Published on: August 14, 2026

External gills, tracheae, and lungs all share which of the following sets of characteristics?

A
Part of gas-exchange system, exchange both CO 2 and O 2 ; increase surface area for diffusion.
B
Used by water breathers; based on countercurrent exchange; use negative pressure breathing.
C
Exchange only O 2 ; are associated with a circulatory system; found in vertebrates.
D
Found in insects; employ positive-pressure pumping based on crosscurrent flow.

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