Which of the Following Present Challenges That Make Gas Exchange

question 6

Multiple Choice

Which of the following present challenges that make gas exchange more difficult for fish than for terrestrial animals?

• A)Water is denser and more viscous than air.
• B)Water contains much less O₂ than air per unit volume.
• C)Gills have less surface area than lungs.
• D)Unidirectional flow of water is less efficient than tidal ventilation.
• E)Diffusion occurs more slowly in water than in air.

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