It is b, increased fertility.
Answer:
1)women gained more rights
2)brought more immigrants causing a language barrier and taking jobs from american citizens
Explanation:
<span>The lungs are the respiratory structure that controls breathing. They make up a substantial part of the respiratory system, along with the trachea, the ribs, the intercostal muscles and the diaphragm. Each lung contains small tubes called bronchioles which end in air sacs called alveoli.</span>
