1a. Photosynthesis and chemosynthesis are the primary sources of energy in all environments. Photosynthesis is derived from sunlight and powers most ecosystems through plants and continues up the food chain. Chemosynthesis is the primary source of energy for areas without a source of sunlight such as subterranean caves and the deep ocean. Chemical compounds are broken down and reformed to provide energy.
2a.Food chains distribute energy throughout the ecosystem
2b. Energy is provided by the sun
3. ATP is used to store sunlight energy