The first act in taxonomy is

What is the smallest unit of classification?

.......... is a group of closely related species.

What do the different categories of taxonomy represent?

Which of the following statements are correct?
$(i)$. Genus comprises a group of related species.
$(ii)$. Taxon represents a taxonomic group of individual organisms.
$(iii)$. Family comprises a group of related genera.
$(iv)$. Taxonomic category class includes related orders.

Hierarchical classification means