Air is conducted/entered through the Bronchi. The trachea is the windpipe and is a passage way for air. The alveoli are the tiny sacs that help transport carbon dioxide and oxygen to and out from our lungs. D takes the blood and makes it de-oxygenated I think. The best answer would be A.
The hospital is an important public health tool for addressing heart disease
The correct answer is 5 million. Yearly, almost 5 million car collisions occur because of many factors. Factors such as distracted driving, over speeding, drunk driving, recklessness, weather factors and also environmental factors, traffic issues may also be included with regards to collisions.