What is the initial source of energy in all ecosystems?

cells are the innermost source of energy in all organisms. please give me brailiest

Hello There

The Sun is the major source of energy for organisms and the ecosystems of which they are a part. Producers, such as plants and algae, use energy from sunlight to make food energy by combining carbon dioxide and water to form organic matter. This process begins the flow of energy through almost all food webs.

Explanation:

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