Each category of taxonomic hierarchy is referred to as a unit of . . . . . . .

Taxonomy is defined as..........

Which of the following characters given below displays the description of the lowest taxonomic category of organisms in the plant and animal kingdom?

What is a Kingdom?

$A :$ Members of a species are reproductively isolated from the members of other species.
$R :$ Species is the basic taxonomic category.

What is the meaning of classification?