What is the group of individuals that share maximum characteristics, have maximum similarity, and have the ability to interbreed to produce fertile offspring called?

Which of the following statements are not correct?
$(i)$ Lower the taxon,more are the characteristics that the members within the taxon share.
$(ii)$ Order is the assemblage of genera which exhibit a few similar characters.
$(iii)$ $Cat$ and $dog$ are included in the same family Felidae.
$(iv)$ Binomial nomenclature was introduced by Carolus Linnaeus.

Explain the terms Taxa,Taxonomy,and Systematics.

In hierarchical classification,the class is interpolated between:

Which of the following taxonomic categories contains organisms least similar to one another?

When is a rank called a taxonomic category?