<span>The organism is multicellular, has tissue organization, and has no cell wall.</span>
B. meiosis produces cells that are used in reproduction.
There is no answer that is right except for C. Natural Selection.
Genetic Recombination doesn't change gene frequency;nor does migration. (Unless it's local)
Mutation could be the answer, but since mutations are too rare to really power Evolution, the only logical answer is Natural Selection.
