Answer # 1. Groups. Friends. In friendship, and in unity, there is strength.#2. Mom and dad. That's what they're there for.
#3. People who like to help others. "Lean on me, when you're not strong..."
#4. Myself. I am stronger than even I realize sometimes.
#5. Non-theistic Faith (..."that the Universe is unfolding as it should", to quote Spock.)
I'm sure there are other answers.. I hope your paper isn't an attempt to show that all other answers are inadequate... 
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Calvin: "No efficiency, no accountability... I tell you, Hobbes, it's a lousy way to run a Universe." -- Bill Watterson