$A$ group of organisms that are very similar to each other and can freely interbreed in nature constitutes a .......

Fill in the blanks $A$ and $B$ in the following taxonomic hierarchy:
Kingdom $\rightarrow$ Phylum $\rightarrow$ $[A]$ $\rightarrow$ Order $\rightarrow$ $[B]$

Which of the following is true for the 'Father of Taxonomy'?

Which of the following is a taxon?

The correct sequence of taxonomic categories is

Genus is a category which comes in between the