Although the terms reactant and reagent are often used interchangeably, a reactant is more specifically a substance that is consumed in the course of a chemical reaction. Solvents, although they are involved in the reaction, are usually not referred to as reactants.
Animals that live in water, usually called aquatic animals, include fish, cetaceans, certain types of turtles and other reptiles, and amphibians. There are also a number of semiaquatic animals, such as alligators, hippopotamuses and penguins, that depend on and live in water most of the time. Continue Reading.
Those living in the icy water have blubber (a thick layer of fat under the skin). Many Arctic animals live in the ocean. Some of these animals are called mammals. Polar bears, walruses, seals and whales are mammals that live in the ocean.