Mouth, pharynx, esophagus
Answer:
Nonliving aspects of an ecosystem are known as (Abiotic)
It's G, since plants need carbon dioxide to perform photosynthesis
The disease is mainly caused by a lack of a slippery substance in the lungs called surfactant. This substance helps the lungs fill with air and keeps the air sacs from deflating. Surfactant is present when the lungs are fully developed.
https://medlineplus.gov/ency/article/001563.htm
Hemoglobin is a special protein in the blood that captures and carries oxygen.