To be exact the critical known’s of life are in a physical perceptiveness is hard, but when understood In a higher psychic like sense the ability to perceive light due to using 25 percent more of our brains we understand life is a constant struggle. But, Why? This is due to the fact that our strongest ability is to survive and then adapt. Life is the physical awareness of the danger and evolving to constitute it. Life is what you make it after all. That meaning in a literal sense.