What is the term for living or growing in water?

The term "aquatic" specifically refers to organisms or processes that live or grow in water. This includes a wide range of life forms, such as fish, aquatic plants, and various types of invertebrates that thrive in freshwater or saltwater environments. The prefix "aqua" means water, so aquatic directly pertains to life in or associated with water bodies.

The other terms, while related to habitats, indicate different environments. "Terrestrial" refers to organisms that live on land. "Marine" pertains specifically to oceanic or saltwater environments, which is a subset of aquatic. "Wetland" describes areas where water covers the soil or is present near the surface for part of the year and can include both aquatic and terrestrial ecosystems. Therefore, "aquatic" is the most inclusive and direct term for anything that is inherently associated with water.