I believe c is the correct answer.
The answer is ...They should check their facts and exchange questions with each other. .
Hope this helps
The answer to this is D i think.
1.respiration
2.diaphragm
3.lungs
4.inhaling
5.out
6.
7.i think trachea
8.rib cage
not sure for 3 and 6 cuz diagram is needed
