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.
I believe that the answer is B. a fertilized egg splits in two but I could be wrong
Answer:
1. Vestigial organs.
2. Homologous structures.
3. Analogous structures.
YYgg is an example of a genotype.
because genotype is the genetic makeup and phenotype is the physical appearance