If you want to determine if planets farther from the sun have a longer orbital period because they have a longer orbit or because they move at a slower pace. What additional information would you need to answer this question? Please help ):

the answer is:

carbon dioxide

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.

the answer is cell division : )