Explanation:
Like most stars in our universe, the Sun is on the main sequence stage of its life. This means nuclear fusion reactions in its core fused hydrogen into helium. However, this process cannot last forever since there is a finite amount of hydrogen in the core of the Sun. Currently it has more than 72% hydrogen.
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D. Substances that are against the law for people of any age to manufacture, possess, buy, or sell
Exercise can improve your social and mental health because when you are done exercising you feel good about yourself and want to do things.
