What critical component is needed as a constant input into an ecosystem in order to keep
it functioning?

Photosynthesis is a critical component needed as a constant input into an ecosystem in order to keep it functioning.

Explanation:

Photosynthesis is the main process by which food enters in an ecosystem.

Photosynthesis is the process by which plants produce their own food from sunlight. This energy by photosynthesis travels from one organism to another in the ecosystem.

In the process of photosynthesis, oxygen is also produced which is required by organisms for respiration.

Besides this, both abiotic and botic components of an ecosystem are equally useful for the proper functioning of an ecosystem.

explanation:

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answer; i believe that the correct answer is (lung);