The least amount of time listed that is sufficient to benefit from cardio exercise is 30 min
I think roughly about a paragraph to conclude your essay
Some health conditions may cause depression-like symptoms. For example, hypothyroidism is known to cause a depressed mood in some people. Mono can drain a person's energy. When health conditions are diagnosed and treated by a doctor, the depression-like symptoms usually disappear.
Getting enough sleep and regular exercise often has a positive effect on neurotransmitter activity and mood.
Answer:
D.
Explanation: Until recently, most people didn't know enough about disease to be
able to document it.