Question

which type of transport requires energy to move molecules from an area of lower concentration to an area of higher concentration? active isotonic passive diffusion osmosis

Explanation:

Active transport moves molecules against the concentration gradient (from lower to higher concentration) and requires energy input, usually in the form of ATP. Diffusion and osmosis are passive processes that move molecules down the concentration gradient (from higher to lower concentration) without energy input. Isotonic refers to a solution with the same solute - concentration as another solution and is not a type of transport for this context.

Answer:

active