Answer:
Explanation: being a team member is certainly a big task. The biggest factors pertaining to successful teamwork are building trust, physical proximity, optimal conditions, team member self-awareness, and a lack of purpose.
The main idea doesn't explain in detail why it is the main idea. It doesn't prove that it is the main idea, it only states so.
Answer:
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Morose is gloomy; ill-humor as sullen is sulky
