What is lacking in the deep ocean ecosystem?

At the bottom of the ocean, one of the things that is not there is light.

Explanation:

This is because the sunlight penetrates the water only to a certain depth, (approximately 200 meters). It is said that the sunlight that penetrates the surface of the water, only 1% can reach 200 meters, and yet there are areas where this penetration may be less, depending on how cloudy the water is.

At the bottom of the ocean the lack of light also generates that the process of photosynthesis does not exist, so there are no plants at the bottom of the ocean either. The living beings that live there, get their food from the things that fall from above or also eat each other.

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