How do you determine the scientific name of an organism?

The scientific name of an animal, plant, bacteria, or so on is made up of the genus of the organism and the species name. (For example, Tyrannosaurus rex. This animal belongs in the genus Tyrannosaurus, suggesting that it is a large carnivore that lived long ago that used wits, vision, and bone- crushing force to disarm prey. The species name rex leads a scientist to believe that it is considerably large and common during the very end of the cretaceous epoch.) Occasionally, a third name, or a subspecies name, has to be put into use as in the case of the African Lion, or Felis panthera leo. The term felissuggests that it is a cat. Panthera is used to describe a big cat who is fast, long, and streamlined. Leo tops it all of and classifies the African Lion.