Answer:
ive had that before it went away eventually id.k what i had
Explanation:
Answer:
the main site of gas exchange is in the lungs between the alveoli and a family of really small blood vessels called capillaries. Which are placed in the walls of the alveoli.
Explanation:
A healthy adult heart rate can range from 60 to 100 beats per minuteduring rest. Kids' heart rates can be as low as 60 beats per minute during sleep and as high as 220 beats per minute during strenuous physical activity.
