Here is the revised text with improved grammar and unnecessary words removed: "Which characteristics pertain to natural selection? Choose three options. It influences populations. It impacts individuals only. It happens in the presence of genetic variation. It happens when organisms are genetically identical. It favors the survival of organisms with certain traits. It randomly selects organisms for survival."

The characteristics that pertain to natural selection are: 1) It influences populations, 2) It happens in the presence of genetic variation, and 3) It favors the survival of organisms with certain traits. These three options directly relate to the process of natural selection as described by Charles Darwin.

1. It influences populations: Natural selection acts on the level of populations. The traits that are advantageous for survival and reproduction spread through the population over generations.

2. It happens in the presence of genetic variation: Genetic variation is crucial for natural selection because without differences in traits, there would be no basis for selecting one variant over another.

3. It favors the survival of organisms with certain traits: Organisms with traits that provide a survival or reproductive advantage are more likely to pass those traits on to subsequent generations. Over time, these traits become more common within the population.