Final answer:
Photosynthesis in plants and digesting food in the stomach both involve energy conversion. Energy from sunlight is stored in carbohydrates during photosynthesis, which is then released during digestion. Both processes also metabolize carbohydrates to produce carbon dioxide and water.
Step-by-step explanation:
The two changes that have something in common are digesting food in the stomach and photosynthesis in plants. Both of these biological processes involve the conversion of energy from one form to another. During photosynthesis, plants convert sunlight into chemical energy in the form of carbohydrates, which store energy. This energy is later released when organisms, including humans, consume the plants and digest these carbohydrates. During digestion, the stored chemical energy in food is released for the organism to use. In both cases, there is a transformation of energy, which is fundamental to sustaining life.
Another commonality is that both photosynthesis and cellular respiration, which is what occurs when we digest food, metabolize carbohydrates to produce carbon dioxide and water. Moreover, in a broader view of the cycle of energy and matter in ecosystems, the carbon dioxide and water used in photosynthesis are products of cellular respiration, and the carbohydrates produced by photosynthesis are used in cellular respiration as well.