Answer:
The big thing is that, in countries with high life expectancy, their old people are more likely to feel engaged. This can be a cultural difference, or it can be geographical; old people are more likely to do things if they can physically get around.
hope it helps
The answer is: [C]:
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"sustains life and keeps body systems in good repair."
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Answer:
While you sleep bacteria trend to multiply so any bacteria that may be lingering can cause problems then it helps protect your teeth throughout the day by strengthening the enamel before you eat
