The term "benthic" refers to the ecological region at the lowest level of a body of water, including the sediment surface and sub-surface layers. This area is home to various organisms, such as benthic invertebrates, which play a crucial role in the aquatic ecosystem by breaking down organic matter and recycling nutrients. Benthic environments can be found in oceans, rivers, and lakes, and they vary in conditions like temperature, light, and pressure. The study of these habitats is important for understanding biodiversity and the health of aquatic ecosystems, as they are often indicators of environmental changes and pollution levels.