Natural Selection: Natural selection is the mechanism through which certain traits are favored in a population because they increase an organism's chances of survival and reproduction.
Genetic Variation: Genetic variation refers to the diversity of genes within a population. It provides the raw material for natural selection and allows individuals to possess different traits.
Adaptation: Adaptation refers to any characteristic or behavior that helps an organism survive and reproduce in its environment. It is a result of natural selection acting on genetic variation.