Asystem in which only energy but not matter is exchanged

A closed system is a system where only energy is transferred or exchanged with its surroundings. Matter is not part of this exchange. An open system includes the transfer and exchange of both matter and energy with the system's surroundings.

Explanation:do u understand

atp is used for energy.

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.