NCHHSTP Social Determinants of Health. Definitions. The National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention uses the words below to describe health equity and social determinants of health. These words are also used by the World Health Organization and the Department of Health and Human Service's Healthy People 2020.
Scientists have narrowed down several of the most likely causes of mass extinction. Flood basalt events (volcano eruptions), asteroid collisions, and sea level falls are the most likely causes of mass extinctions, though several other known events may also contribute. These include global warming, global cooling, methane eruptions and anoxic eventsâwhen the earth's oceans lose their oxygen.
What is a possible cause of the extinction event called the Great Dying? A. a meteorite impact that killed the dinosaurs B. a great outpouring of lava at the end of the Paleozoic C. a sudden increase in the oxygen content of the atmosphere during the Precambrian D. a new kind of super predator that devoured nearly all of the life in the oceans