Question

as blood passes through the kidneys, useful molecules like glucose and amino acids are reabsorbed so the body doesnt lose them in urine. to do this, kidney cells use energy to move these nutrients back into the blood. this process is an example of: active transport, because energy is needed to move nutrients into the blood passive transport, because nutrients spread out from high to low concentrations osmosis, because water carries the nutrients back into the blood diffusion, because nutrients pass freely through the cell membrane

Explanation:

Active transport requires energy to move substances against their concentration gradient. Since kidney cells use energy to move glucose and amino - acids back into the blood, this is active transport. Passive transport, osmosis, and diffusion do not require energy input for the movement described here.

Answer:

Active transport, because energy is needed to move nutrients into the blood