Why Do Many Large Animals Rely on Internal Transport Systems

question 8

Multiple Choice

Why do many large animals rely on internal transport systems (like the circulatory system) to distribute oxygen?

• A)Diffusion does not occur in organisms with more than about 300 cells.
• B)Large organisms do not need as much oxygen as small organisms, so they use inefficient transport systems like the circulatory system rather than diffusion.
• C)The internal transport system is needed to quickly replace oxygen lost due to the high surface area of the skin.
• D)Diffusion is very slow over all but the shortest distances, so oxygen must be delivered to cells to speed up the process.

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