When a person's respiratory rate is slower than normal, certain conditions, such as bradypnea or apnea, may occur. Bradypnea is characterized by abnormally slow breathing, and may be the symptom of a metabolic disorder or a tumor.
classification, Modern classification is part of the broader science of. taxonomy, the study of the relationships of organisms, which includes collection, preservation, and study of specimens, and analysis of data provided by various areas of biological research.
1 Standard Industrial Classification Codes (SIC Codes) identify the primary line of business of a company. It is the most widely used system by US government, public, and private organizations.  North American Industry Classification System (NAICS Codes) is the alternative code structure, updated every 5 years.