Answer:
Oh boy, here we go again.
Explanation:
Go kill Claire
B . It is completely normal . However if you are experiencing extreme pain stop and consult your doctor . Also if you are prone to any kind heart disease let someone know where you are when exercising or better yet let them be at your side at all times .
The study of the large scale-structure of the human body
Answer:
2. the trachea widens and lengthens.
Explanation:
Moist, smooth tissue called mucosa lines the inside of the trachea. The trachea widens and lengthens slightly with each breath in, returning to its resting size with each breath out.