Answer:
Because it could affect your life in a big way and not only yours but other's around you and could have a life- long effect.
Explanation:
hope this helped.
Probably: I get fewer hours of sleep these days? This might help: http://englishplus.com/grammar/00000214.htm
You would read a autobiography
My and mine. Are possessive.
She asked what I was doing when I knocked at the door.
