Question

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the deepest parts of the ocean have much different food chains than most shallow ocean or terrestrial ecosystems. since there are no plants in these areas, chemoautotrophs usually function as producers in these ecosystems. chemoautotrophs are organisms that make their own food using the chemicals found around them. which statement describes why chemoautotrophs are needed to fill this role in these environments?
chemoautotrophs have eaten all the plants in this ecosystem
sunlight cannot reach the ocean bottom, so plants are unable to grow.
plants are unable to survive in salt water
without pollinators, it is impossible for plants to reproduce at greater ocean depths

Explanation:

In the deepest parts of the ocean, sunlight can't reach the ocean - bottom. Since plants need sunlight for photosynthesis to grow and function as producers, they can't grow there. Chemoautotrophs can use chemicals to make food and thus fill the role of producers.

Answer:

Sunlight cannot reach the ocean bottom, so plants are unable to grow.