Answer:
How often? 2 times a day or minimum 1 times. How hard? depends on age.If the person is below 30, he/she can have a hard workout. How long? 1 or 2 hours per exercise is enough and ideal for everyone.
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Explanation:
C: More children are being born worldwide
Answer:
Yes, for instance...
Picking up trash can be a big help, less pollution for us!
Less factories
Less smokers to prevent air pollution once again.
For the virus right now, wearing mask can help a lot.
Staying quarantined also can help make a difference.
I hope this helps.