Life. Life is a single drop of water.
It's that micro organism in the little pond you all think has nothing to it, life is the algea that grows in that little pond on that small rock.
Life is a precious gift given and taken away, life, it's important without it we would not be here, the oxygen we breath gives us life to a point but the other great gift of life is that our friends, family, coworkers and even pets give us true life and happines.
Life is the heartbeat of our world, without it we would be nothing.