Which of the following are possible causes of global warming? check all that apply. human activitydifferences in emitted energy from earthnatural fluctuationschanges in distance to the sunpoor measurement

Human Activity and Natural Fluctuations

Explanation:

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.