What is the importance of photosynthesis to living organisms?

I've already defined photosynthesis for you. Here's the importance of photosynthesis to living organisms:

• Food Production: Photosynthesis produces glucose, which is the primary source of energy for plants and, indirectly, for almost all other living organisms on Earth. Herbivores eat plants, and carnivores eat herbivores, making plants the base of most food chains.
• Oxygen Production: Photosynthesis releases oxygen into the atmosphere as a byproduct. This oxygen is essential for aerobic respiration in most living organisms, including humans and animals. Without it, most life as we know it could not exist.