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How do plants contribute to the food chain?

Plants form the base of the food chain as primary producers. Through photosynthesis, they convert sunlight, carbon dioxide, and water into chemical energy stored in organic molecules such as glucose. This energy becomes available to other organisms when herbivores consume plants, and then it passes on to higher trophic levels as predators eat those herbivores. In this way plants introduce energy into ecosystems and support the flow of energy and nutrients through the food chain.