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..
This tutorial elaborates on how the nervous system works, particularly at the tissue level of the brain. There are three..
Freshwater ecology focuses on the relations of aquatic organisms to their freshwater habitats. There are two forms of co..
Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designe..
The hominid family diversified from the apes around 6 to 8 million years ago. Since then, the evolutionary path has prov..
This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, an..
