Animal

Animals are multicellular eukaryotic organisms that form the kingdom, Animalia. Almost all animals are able to consume organic material, breathe oxygen, capability to move, reproduce sexually, and grow from a hollow sphere of cells. There are currently over 1.5 million living animal species that have been described (which a majority of them are insects), however, it has been estimated that there is over 7 million animal species in total, concluding that most species are currently undiscovered. They have complex interactions with each other and their environments, which forms food webs. Animals have their own scientific study, which is known as zoology.