When air moves in one direction, it doesn't apply as much force in other directions. This is called the .

they deliver oxygen to the blood

i think the answer is g1

hope i

-lavira: )

option c is the correct answer.

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.