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. Chance events in small populations lead to a. Five populations have the birth and death rates given below.