Darwin’s Theory of Evolution through Natural Selection: FOUR FACTORS VARIATION OVERPRODUCTION (Draw Different Beaks successful in eating different food.) (Draw Sea turtles laying 120 eggs, few survive to adulthood) Differences between individuals of the same species Species produce far more offspring than can possible survive. COMPETITON SELECTION (draw two animals in ( draw an unborn fetus) battle biting at each other) Since food and resources are limited, the offspring must compete to survive. Variations make certain individuals better adapted to their environment. Those individuals are more likely to survive and reproduce.