Choose the TRUE statement(s) about animal respiratory systems. (Select all that apply.)
a. Water breathers have to work harder to get oxygen because there is less oxygen in water than air and water is heavy.
b. All animals have respiratory systems.
c. Unlike air-breathers, water-breathers tend to be the same temperature as their medium, because water has a higher thermal conductivity than air.
d. Water-breathers tend to have higher PCO2 levels than air-breathers because it is more challenging for them to exchange gases.
Answer:
a. Water breathers have to work harder to get oxygen because there is less oxygen in water than air and water is heavy.
c. Unlike air-breathers, water-breathers tend to be the same temperature as their medium, because water has a higher thermal conductivity than air.
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