Answer:
reproduction
population
phenotypes
phenotype
genotype
genotype
mutation
generation
Step-by-step explanation:
Natural selection is differential reproduction among individuals, in a population due to differences in phenotypes, which are said to be adaptive.
Individuals with the adaptive phenotype have a reproductive advantage (increased reproductive fitness); therefore, they contribute a disproportionately high number of progeny to the next genotype.
The adaptive genotype and the underlying mutation will increase in frequency in the generation over time.