While the presence of Islam in West Africa dates back to eighth century, the spread of the faith in regions that are now the modern states of Senegal, Gambia, Guinea, Burkina Faso, Niger, Mali and Nigeria, was in actuality, a gradual and complex process.
Hypoventilation is a condition that arises when air entering the alveoli, small air sacs in the lungs that are the site of respiratory gas exchange, is reduced. This causes levels of oxygen to decrease and the levels of carbon dioxide to increase.
Hypoventilation is causes an increase in CO2 (carbon dioxide) in your blood. This is caused by the lack of breathing, or obtaining oxygen, (on the contrary, hyperventilation is when your body is gaining too much oxygen - people tell the hyperventalator to breath in a brown paper bag to allow CO2 to bind to hemoglobin).