Why is the sun the ultimate source of energy for all living things?

Answer 1

All plants rely upon the sunlight to photosynthesize the food they need to grow, and more importantly to the food chain, to create the nutritious food animals need to survive. Without sunshine, all plants die.

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Plants support the global food chain for all life. Plants are the original food source for all animals, even for carnivores and omnivores. Meat eaters may eat other animals, but eventually those animals in the food chain eat plants. Without plants, plant eating animals die, and without plant eating animals, all carnivorous animals die. Simply put, without plants, all animals die.

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Without the sun, all life dies.

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The sun also keeps the Earth at a reasonable temperature allowing life to evolve and continue, and it allows plants to grow through photosynthesis, which gives animals the energy they need to live and grow, and in the past to make fossil fuels which we use now.