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 9. Chance events in small populations lead to a. 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. There are two plant species in the same habitat. One has 10, the other 14 chromosomes in their somatic cells. The two hybridize and the hybrid produced polyploid seed.