Answer:
The Sun
Step-by-step explanation:
The primary source of energy for food chains in an ecosystem is the sun. Producers, such as plants and other photosynthetic organisms, are able to capture the sun's energy through the process of photosynthesis.
They convert this solar energy into chemical energy in the form of organic compounds like glucose. Producers serve as the foundation of food chains by providing energy-rich nutrients to other organisms.
Consumers, including herbivores, carnivores, and omnivores, obtain energy by consuming producers or other consumers.
Ultimately, all energy in an ecosystem can be traced back to the sun, making it the primary source of energy for sustaining life in food chains.
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