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.
Some, like the rotifers look like protists and even have cilia but they are made of many cells and have organs like other animals. Shown at the left is a very common pond water critter called a Rotifer.hylum Mastigophora: These protists move with a whip like extension.called a flagella. The flagella is a long fibril that is spirally wound and beats or rotates in the water to move the protozoan about. Included in this group is the Peranema (shown at left), the Euglena and the Volvox.