Which of the following statements on lunar movement is correct?

athe sun orbits the moon.
bthe moon orbits the earth.
cthe earth orbits the moon.
dneither the earth nor the moon orbit each other.

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answer is

human impact on the environment can be seen in the deterioration of the !

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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.