For creatures and the ecosystems in which they live, the Sun is the primary source of energy. Plants and algae, for example, use sunlight to create food energy by mixing carbon dioxide and water to build organic matter. Almost all food webs begin with this mechanism, which starts the flow of energy.
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Answer:
A. Sun
Explanation:
For creatures and the ecosystems in which they live, the Sun is the primary source of energy. Plants and algae, for example, use sunlight to create food energy by mixing carbon dioxide and water to build organic matter. Almost all food webs begin with this mechanism, which starts the flow of energy.