The animals
Animals Are those living beings that have movement, fulfill the life cycle of being born, grow, reproduce and die, feel, and feed on organic substances, present in the outside world, that provide them with energy, being called heterotrophs, since they do not produce their own food like plants (autotrophic nutrition). Main characteristics of the animals. Their cellular organization can be eukaryotic or multicellular. In the nutritional aspect, they are heterotrophic beings by ingestion, which is done in one way or another depending on the animal. All animals have an anaerobic metabolism, that is, they breathe oxygen and cannot live without it. Another common characteristic of all animals is that they reproduce sexually, usually finding a male and a female animal in the process. They are also symmetrical beings, with the exception of, for example, sponges. By having symmetry, they present a regular arrangement of the different parts or structures of their body along one or more body axes...