Indica and sativa are the two main types of cannabis. Cannabis is one of the oldest crops known to mankind, with records of its cultivation dating back thousands of years. Today, it is widely accepted that marijuana has two different species: Cannabis indica and Cannabis sativa.ndica and sativa are the two main types of cannabis. Cannabis is one of the oldest crops known to mankind, with records of its cultivation dating back thousands of years. Today, it is widely accepted that marijuana has two different species: Cannabis indica and Cannabis sativa.
That would make medical errors the third-leading cause of death in America, behind heart disease, which is the first, and cancer, which is second. The new estimates were developed by John T. James, a toxicologist at NASA 's space center in Houston who runs an advocacy organization called Patient Safety America.
Fatal Illnesses in U.S. In 2006, heart disease proved the most common cause of death in the U.S., according to the Centers for Disease Control and Prevention. This group of diagnoses includes heart attacks, sudden cardiac arrests and disorders of heart rhythm. Cancer, a group of over 130 separate diseases ranked second, as a cause of death.