Question

which taxonomic unit share the least number of features?

Answer 1

Answer:

Out of all taxa, species is the basic unit for classification. It is the lowest unit in which organisms  sharing many similar characteristics are included. In the next higher taxon i.e. genus, closely related species are included. So in genus, the number of organisms are much more than in a single species. As we go up the taxonomic hierarchy, the number of organisms in each taxon keeps increasing, compared to the below taxon. So out of all the taxa, species has the least number of organisms and they share the most similar characters, compared to organisms in the higher taxa.