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Answer:
A, C, and D
Some animals can only live in super salty waters, so that is a big factor, and most animals feed off plankton, and a lot of animals in the ocean need either need to be under a lot of density or a little bit. Which is why there are different Ocean floor levels.
The maintenance of marine food chain is most directly influenced by the supply of phytoplankton.
Phytoplankton form the base of virtually all the marine food chains. They are otherwise known as marine algae and are responsible for fixing carbon dioxide into carbohydrates - a process known as photosynthesis.
Thus, phytoplanktons are the producers of marine ecosystems on which consumers directly or indirectly depend for their energy.
This means that the supply of phytoplankton will directly influence the marine food chain the most.
More on phytoplanktons can be found here: https://brainly.com/question/7459157?referrer=searchResults