How is the process of photosynthesis central to sustaining life on earth?

Photosynthesis is the process by which green plants manufacture their foods using the energy from the sun. Plants are the only living organism that have the ability to tap energy from the sun and use it to produce their food. The food produce by plants are used by plants and all other living organisms for survival. The herbivores feed directly on plants while carnivores feed on herbivores. The omnivores animals feed on both herbivores and carnivores. Thus, all living organisms on the earth depend on photosynthesis and on plants for the production of foods from which they derive the energy that they use to carry out their life activities.