Which of the following options indicates a decrease in variations?

What is the full form of $ICBN$?

Which of the following statements is $NOT$ associated with classification?

Select the correct statements $(i-iv)$ regarding taxonomic categories.
$(i)$ Each step or rank in hierarchy is called taxonomic category.
$(ii)$ Species is a group of individual organisms with fundamental similarities capable of breeding among themselves.
$(iii)$ Taxonomic studies of all unknown organisms have led to the development of common categories like kingdom,phylum or division,class,order,family,genus and species.
$(iv)$ Lower the category,greater is the difficulty of determining the relationship to other taxa at the same level.

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

The biological concept of species was proposed by ........