Canidae and Felidae are families of ........ and ........ respectively.

The practical purpose of taxonomy or classification is .........

Assertion $(S)$: Carolus Linnaeus is known as the father of taxonomy.
Reason $(R)$: Linnaeus proposed the binomial nomenclature system and conducted extensive studies in classification.
$(A)$ Both $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
$(B)$ Both $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.
$(C)$ $S$ is true and $R$ is false.
$(D)$ $S$ is false and $R$ is true.

Why does the problem of classification become more complex at higher taxonomic categories?

Define a taxon. Give some examples of taxa at different hierarchical levels.

Which scientific term is used for a convenient category for the study of organisms like fishes and mammals?