photosynthesis makes carbon molecules an excellent source of fuel for all living things. During photosynthesis, plants absorb carbon dioxide and sunlight to create fuel—glucose and other sugars—for building plant structures. This process forms the foundation of the fast (biological) carbon cycle.
Plants use carbon dioxide to make food and nutrients. During photosynthesis, plants produce oxygen, which is necessary for animals to live. in exchange, animals exhale carbon dioxide, which is then used by the plant, again.
