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.
Bosmina longirostris. Water fleas belong to the Crustacea, a large group of 'jointed limbed' animals, most of which live in water. Water fleas are placed in the order Cladocera <see footnote> and are probably called 'fleas' because they move through the water by a sort of hopping. Water fleas are very common in fresh water, in Britain you can find about 80 different species, in The Netherlands about a 100 species.