Q. Which among the following is the lowest level of a body of water such as an ocean or a lake?
Answer: Benthic
Notes: The benthic zone is the ecological region at the lowest level of a body of water such as an ocean or a lake, including the sediment surface and some sub- surface layers. Organisms living in this zone are called benthos. They generally live in close relationship with the substrate bottom; many suchorganisms are permanently attached to the bottom.