Question

Which of the following features does all gas exchange have in common?

• A. They are enclosed within ribs.
• B. They are maintained at constant temperature.
• C. The exchange surfaces are moist.
• D. They are exposed to air.

Answer 1

The correct option is C The exchange surfaces are moist.

Out of all the options given the third option is the correct one.
Exchange of gases is a feature that is common in all living things. Irrespective of the genera of living organisms, all organs that exchange gases are characterized by features such as- thin, moist, large surface area and a large capillary network.