I believe the answer would be bone.
Answer:
The second line of defense.
Explanation:
The second line of defense, part of the immune system response, is Nonespecific Resistance.
True,but I think a lot of health disorders are not noticeable
1. c
2. False (pulmonary artery carries blood from RV and pumps to the lungs)
3. False
4. True (have trouble breathing while laying down)
5. D
6. True
7. True
8. False
9. B.
10. True