In the deep water where there is no sunlight, how do bacteria and plants create
their food?

Bacteria and Plants use the process of chemosynthesis to create/make food using chemical reactions.

Explanation:

"Autotrophs that perform chemosynthesis do not use energy from the sun to produce food. Instead, they make food using energy from chemical reactions, often combining hydrogen sulfide or methane with oxygen. ... Bacteria that live in the deep ocean, near hydrothermal vents, also produce food through chemosynthesis."

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it restores trees to areas where they once grew.