What is the basis of modern taxonomic studies?

Which of the following is incorrect $w.r.t.$ Species?

Identify the correct sequence of taxonomic categories from Kingdom to Species.

Which of the following groups of organisms can interbreed?

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

Which of the following taxonomic categories is being described by the given statements $(i-iii)$?
$(i)$ It is the basic unit of classification.
$(ii)$ It is defined as the group of individuals which resemble in their morphological and reproductive characters and interbreed among themselves and produce fertile offspring.
$(iii)$ Human beings belong to the species $sapiens$ which is grouped in the genus $Homo$.