How are animals classified?​

In accordance with the Linnaeus method, scientists classify the animals, as they do the plants, on the basis of shared physical characteristics. They place them in a hierarchy of groupings, beginning with the kingdom animalia and proceeding through phyla, classes, orders, families, genera and species.

There are seven main taxonomic ranks:

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the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.