Most of the energy used by living things comes either directly or indirectly from where?
earth
water
horizon
sun
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis . This is the process in which plants and certain other organisms (see Figure below ) synthesize glucose (C 6 H 12 O 6 ). The process uses carbon dioxide and water and also produces oxygen. The overall chemical equation for photosynthesis is:.