tetrahydrocannabinol (THC) [-hiâ²drÅkÉnabâ²inol] the active principle, occurring as two psychotomimetic isomers, in the hemp plant Cannabis sativa, used in the preparation of marijuana, hashish, bhang, and ganja. THC increases pulse rate and has variable effects on blood pressure.
Over the last 3.7 billion years or so, living organisms on the Earth have diversified and adapted to almost every environment imaginable. The diversity of life is truly amazing, but all living organisms do share certain similarities. All living organisms can replicate, and the replicator molecule is DNA. As well, all living organisms contain some means of converting the information stored in DNA into products used to build cellular machinery from fats, proteins, and carbohydrates. Three Domains of Life
One of the primary responsibilities of systematic biology is the development of our biological nomenclature and classifications. Nomenclature is not an end to systematics and taxonomy but is a necessity in organizing information about biodiversity. Nomenclature functions to provide labels (names) for all taxa at all levels in the hierarchy of life. Biological nomenclature is, to some degree, the parlance of systematic biology. It derives from the binomial (or binominal) nomenclature that was originally codified in the works of Linnaeus, Species Plantarum (1753) and Systema Naturae, 10th Edition (1758).