Oxygen enters the lungs, then passes through the alveoli and into the blood.
In 2006, the average American spent $3,372 on health care.
Very heavy perspiring or severe diarrhea can result in a serious reduction in the body's water content known as dehydration.
Answer:
<h3>I THINK ITS LETTER B</h3>
Explanation:
I HOPE IT HELPS :)
The layer that encloses and protects the heart is
Pericardium
