The scientific term for organisms that live in water is aquatic organisms. This category includes a diverse range of species from various environments, such as oceans, rivers, lakes, and wetlands. Aquatic organisms can be further classified into plankton (drifting organisms), nekton (swimming organisms), and benthic (bottom-dwelling organisms). They play essential roles in aquatic ecosystems, contributing to nutrient cycling, food webs, and oxygen production. Studying aquatic organisms is vital for understanding ecological dynamics and addressing environmental challenges faced by freshwater and marine habitats.