Answer :
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.
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.