evolution comic prologue review

The prologue of this comic series talked a lot about natural selection and gave an overview on the beginnings of evolution. I learned that natural selection is the process in nature in which the most favorable traits are passed on to a species offspring.These arise through mutations in the cell that give the organism an advantage in its changing surroundings. In order for natural selection to occur these things need to happen: (1) there needs to be variation in certain traits of a population, (2) not all organisms can survive to reproduce offspring and pass on their traits, (3) survival cannot be random, and (4) the favorable traits must be heritable.