Here's a breakdown:
* Cellular respiration is a series of metabolic reactions that occur in the cells of organisms to convert chemical energy from nutrient molecules (like glucose) into ATP, the primary energy currency of cells.
Let's look at the other options:
* Photosynthesis: This process uses light energy to convert carbon dioxide and water into glucose and oxygen. It's the opposite of cellular respiration and stores energy in the form of glucose, not ATP.
* Active transport: This process moves molecules across a cell membrane against their concentration gradient, requiring energy input (ATP) to do so. It uses ATP, not releases it.
* Diffusion: This is the movement of molecules from an area of high concentration to an area of low concentration. It happens passively and doesn't directly involve ATP release.
Therefore, cellular respiration is the only process that releases energy in the form of ATP.
