Species

It is the primary unit when discussion biological diversity. Every specie exists in their own form, shape, region, and behavior. To classify each individual organisms as the same specie, they must match the one criteria which is the ability to reproduce. When two individuals are capable of inbreeding, itis considered as the same specie. It is said that in birds when it comes to mating, each bird has a different behavior, songs, and patterns so other specie will not be confused with each other. Because their behavior is different, not many birds that are distant of each other will interbreed. In addition, not only the morphology but the DNA sequence can show how each specie has their own sequence to make them different from another.