Question

multiple - choice question
the type or organisms that form the base of the food chain and feed everything else in the ecosystem are called
autotrophs or primary producers
heterotrophs or consumers
decomposers
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Explanation:

Autotrophs or primary producers, like plants and some bacteria, use photosynthesis or chemosynthesis to produce their own food from sunlight, carbon - dioxide, and other simple substances. They form the base of the food chain as they provide energy for all other organisms in the ecosystem. Heterotrophs or consumers rely on eating other organisms for energy, and decomposers break down dead organisms.

Answer:

autotrophs or primary producers