What are 2 food making processes in a chain?

Two food-making processes in a chain are photosynthesis and cellular respiration. Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create glucose, or food. Cellular respiration is the process by which organisms use oxygen to break down glucose and release energy. These two processes are essential for the survival of all living things, as they provide the energy and nutrients that organisms need to grow and function.