Start with a Slime

How can a slime survive by devouring other creatures at the beginning? Evolution, constant evolution. From bedbugs that can be crushed to death with one foot, to snakes that can devour small animals, they are getting bigger and bigger and devour more and more types. The earth is but a speck of dust in my food. This so-called universe is just a corner of my dinner plate. In the end, maybe I am just a food!