Taxonomy is a dynamic and important field of biology. Taxonomy attempts to create order out of a great deal of diverse information to enable biologists to draw conclusions and make fact based decisions about organisms.
Original classification schemes were based on apparent morphology of an organism, its habitat, method of getting energy and nutrition and replication. With the advent of DNA and protein sequencing many of the old categories were modified and new ones created. The concept of sequencing of the 16s rRNA as a method to determine evolutionary and taxonomic relationships are introduced.