What is the ultimate source of energy that drives the food chain?

The ultimate source of energy that drives the food chain is the sun. Through the process of photosynthesis, plants and other autotrophic organisms convert sunlight into chemical energy, in the form of glucose. This energy is then passed along the food chain as organisms consume and are consumed by other organisms.

Without the sun, plants would not be able to produce their own food, and the entire food chain would collapse. The sun provides light and heat energy that is essential for life on Earth, and plays a crucial role in sustaining ecosystems and biodiversity. Ultimately, the sun is the primary source of energy for all living organisms on Earth.