Here's why:
* Photosynthesis: Plants and other photosynthetic organisms use sunlight, water, and carbon dioxide to create glucose (sugar) and oxygen. This oxygen is released into the atmosphere.
* Cellular Respiration: Living organisms, including plants and animals, use oxygen to break down glucose, releasing energy in the form of ATP. This process also produces carbon dioxide as a byproduct, which is then used in photosynthesis.
So, it's a beautiful cycle: photosynthesis produces the oxygen used in cellular respiration, and cellular respiration produces the carbon dioxide used in photosynthesis.
