Answer:
where is option I can't see
As you increase exercise and muscle activity, your heart rates increases. That is one feedback mechanism. Your heart delivers oxygen and nutrients to your muscle and other parts of the body quicker.
I would say this is an expository text.
Correct answer is 2 - To breathe
Answer:
1. Differences in air <u>pressure</u> cause movement in the air, which creates <u>wind</u>
3. As the air <u>cools</u> it becomes more dense and <u>falls</u> to the earth's surface
Explanation:
hope this helps :)