Not clear on Phylum..how are birds, snakes, humans, etc. similar?
Biology - Hierarchy of classification
Hierarchy of classification
Every organism  is classified into a kingdom  that describes general
features of the organism.
Organisms can also be classified on a number of other levels: and species.
As you move up the hierarchy of classification from Kingdom to Species,
organisms within a group become more closely related (share more features)
and the number of different organisms in the group decreases.
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