The body's primary source of energy is the nutrients from food and also water but mostly food <span />
Because it teaches their children wrong from right
Answer: A
Explanation: The blood–air barrier (alveolar–capillary barrier or membrane) exists in the gas exchanging region of the lungs. It exists to prevent air bubbles from forming in the blood, and from blood entering the alveoli. ... The barrier is permeable to molecular oxygen, carbon dioxide, carbon monoxide and many other gases.
Like what type of method? Method to.....? what practice? I need more info
TRUE!!! because it lets the doctor know of the patients medical history