I think the answer is naturally acquired active immunity..also depends on which disease
Answer:
Ophthalmoscopy, also called funduscopy.
Baboons, sparrows, and human beings are considered both primary and higher order consumers because they all eat plants and meat.
Primary consumers feed on producers/ plants. Then secondary consumers feed on primary consumers.
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
The most well known answer according to my bio teacher is nitrogen
