Which Statement About CO₂ Is True

Multiple Choice

Which statement about CO₂ is true?

A) CO₂ is less soluble in water than is O₂.
B) The amount of CO₂ in the atmosphere is extremely large.
C) P_CO2 is lower in stagnant water than in fast-flowing water.
D) For air-breathing animals, CO₂ readily diffuses from the body to the environment at sea level and at high altitude.
E) Aquatic ectotherms typically face challenges in CO₂ exchange.