Correct Answer: Saltwater ecosystem

Solution : The correct option is the Saltwater ecosystem .

The benthic zone is found in saltwater ecosystems. It refers to the lowest level of a body of water such as an ocean or sea, comprising the sediment surface and subsurface layers, along with the organisms that inhabit these bottom regions. The benthic zone is especially diverse in marine ecosystems, encompassing a wide range of habitats from shallow coastal areas to the deep-sea abyssal zone. Benthos are organisms that live in the benthic zone.