The narrowest group in a classification system is called a species. Organisms within a species share similar characteristics and can interbreed to produce fertile offspring.
Species
The narrowest level of classification is species. Organisms within the same species share similar characteristics and can interbreed to produce fertile offspring.
Genus.
Genus.
Organism, Kingdom, Phylum, Class, Order, Family, Genus, Species.
There is NO opposite for species (a taxonomic classification).However, the opposite taxonomy of species and subspecies (the narrowest classifications) would be a kingdom (the most general classification).
Species
Organism is the general and therefore largest classification group for the body. The next smallest classification is the organ system.
The next sub-group in classification class order is family.
No
Order