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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Definitions:

Dentoid

Resembling a tooth in shape or function.

Dentibuccal

Pertaining to the area inside the cheek adjacent to the teeth.

Denticle

A small, tooth-like projection found in some animals and plants, sometimes serving as a defensive or feeding aid.

-rrhea

A suffix used in medical terms to denote a flow or discharge of a substance, often abnormal.