Mechanisms of Reproductive isolation.
Taxonomy is the branch of biology concerned with naming and classifying organisms.
Living things are categorized according to species, genus, family, order, class, phylum, etc. An eighteen century Swedish Naturalist Carl Linneaus advocated a system of taxonomy based on latin names. Species are reproductively isolated from each other. Two types of lizard can produce fertile hybrid offspring via artificial insemination, but they have non-overlapping distributions. One lives in the southern hemiphere and the other in northern hemisphere.