regurgitation (Science: cardiology, gastroenterology) A backward flowing, as the casting up of undigested food or the backward flowing of blood into the heart or between the chambers of the heart when a valve is incompetent. Origin: L. Gurgitare = to flood..
Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..
Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understa..
The nucleus containing the genetic material, DNA, and the mitochondria, well-identified as the "powerhouse of the cell",..
The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas o..
If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..
Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..
