What kind of life is defined as aquatic life?

Aquatic life is defined as plants and animals that inhabit water environments, including oceans, rivers, lakes, and wetlands. This encompasses a wide range of organisms, from various species of fish to amphibians, mollusks, and aquatic vegetation like algae and submerged plants. These organisms are specially adapted to live in aquatic environments, exhibiting features such as gills for breathing underwater, streamlined bodies for efficient movement in water, and specific reproductive strategies that facilitate life in their aquatic habitats.

The other options do not accurately capture the essence of what constitutes aquatic life. The first option refers to terrestrial organisms, which do not fit the definition as they primarily inhabit land. The second option unnecessarily excludes microorganisms, which are often significant components of aquatic ecosystems, especially in terms of nutrient cycling and food webs. The last option narrows the definition too much by only including fish, ignoring a plethora of other aquatic life forms like amphibians, crustaceans, and aquatic plants that are equally important in these ecosystems.