Why do you think pneumonia causes a symptom like fatigue? What substance is being limited that all cells require?
A. mucus
B. carbon dioxide
C. cilia
D. oxygen

Respuesta :

Oxygen is the answer hope it helps

Answer:

D. Oxygen

Explanation:

A lack of oxygen causes fatigue. As a person with asthma, I know this from experience. Lack of O2 causes dizziness, tiredness, headaches, etc.