Organisms that can produce their own food from an external source of energy without having to eat other organisms are called

Herbivores

Explanation:

These organisms produce their own food are like plants.

However, there are also fungi. Don't get these two messed up though.

Fungi don't produce any food for itself. It absorbs energy from decaying organisms.

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you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.