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What is the source of carbon for the organisms of food chains?

User Poff
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The answer would be the sun the sun helps producers make food through photosynthesis
User Chor
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Answer:

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

Step-by-step explanation:

User Sunnyone
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