Which of the Following Is NOT a Mechanism to Circumvent

question 85

Multiple Choice

Which of the following is NOT a mechanism to circumvent the limits imposed by diffusion?

• A)placing metabolically active cells in the interior of an organism and metabolically inert structures along the exterior surface
• B)using vascular tissue to transport materials throughout the plant body
• C)placing metabolically active cells along a series of canals and pores
• D)using a circulatory system to distribute materials throughout the animal body
• E)All of these choices are correct.

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The aggregate sum of products and services used within the boundaries of a nation.

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The total value of all goods and services produced within a country's borders.

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The exchange of goods and services between countries, involving exports and imports.