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.
So they are sometimes also called sea squirts. They may do this to get rid of something in them, or when they are disturbed. Colonial ascidians: Some ascidians form as solitary animals, sometimes called simple ascidians. Other ascidians may form colonies with many individual animals called zooids. They are called colonial or compound ascidians. In some colonies, the zooids are quite independent of one another.