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.
Tardigrades (Waterbears) are a phylum of invertebrate animals,  belonging to the articulata and containing app. 750 species. They  are a sister group to arthropoda, though s â¦ ome aspects remind to  nematods. Tardigrades are quite small meiofaunal animals, the body  length ranges between 0.08 mm and 1.5 mm. They have usually four  pair of legs (in some species a reduction occurs) and a nervous  system with ventral ganglia and a lobed brain.