Natural selection is differential survival and reproduction of different phenotypes in a population.
Evolution is defined as changes in genotypic frequencies in a population due to selection.
Natural selection is differences in survival among individuals. Evolution is caused only by natural selection. Nigeria currently has a much higher birth rate than does Sweden b. Sweden has a much lower birth rate than does Nigeria c. The survivorship of newborns in Nigeria is lower than in Sweden e. The population of Sweden grows at a slower rate 7.