The United States uses about . of the worlds energy

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17%

Explanation:

Demand. With less than 5% of the world's population, the U.S. consumes almost 17% of the world's energy and accounts for 15% of world GDP.

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The United States uses about 17% of the worlds energy

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.