give reason animals must be classified
The grouping of similar organisms based on specific characteristics is called classification. International Commission of Zoological Nomenclature, or ICZN, provides rules for classifying animals. Carolus Linnaeus developed a system that has seven levels: Kingdom, Phylum, Class, Order, Family, Genus, and Species.
Animals are a major group of organisms that are classified under the kingdom Animalia or Metazoa. Animals are multicellular capable of locomotion (movement) and they can respond to their external environment (homeostasis), and feed by consuming other organisms (heterotrophic). Animals have several characteristics such as the absence of cell wall that distinguish them from other living things.
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