Here's why:
* Species: A species is defined as a group of organisms that can interbreed and produce fertile offspring. This means they share a very high degree of genetic similarity and physical characteristics.
* Genus: A genus includes a group of closely related species. While species within a genus share many similarities, they are distinct enough to be considered separate breeding groups.
* Family: A family contains several related genera. Organisms within a family share fewer characteristics in common compared to species within a genus.
* Order, Class, Phylum, Kingdom, Domain: As you move up the hierarchy, the number of shared characteristics decreases. These higher levels group organisms with more general similarities, but less specific shared traits.
In summary: The closer you are to the species level in the classification hierarchy, the more characteristics the organisms within that group will have in common.
