The benthic zone is an lowermost ecological region of the aquatic water body like ocean, river, lakes and pond. It includes the sediment surface and the layers of water above it. It receives very little sunlight penetration of only 1%. As a result of this, the zone remains dark and animals show bio-luminescence in order to search and capture prey.
On the basis of the above explanation, the benthic zone in a lake can be found C.along the bottom.
Sedimentary rocks are deposited one on top of another. The youngest layers are found at the top of the sequence, and the oldest layers are found at the bottom.
