Which of the following is NOT an example of natural selection? A Bacterial populations in hospitals develop resistance to drugs used to combat infection by them. Bacterial populations in hospitals develop resistance to drugs used to combat infection by them.

B Plants with thorns are less likely to be eaten by herbivores than other members of the same species that lack thorns. Plants with thorns are less likely to be eaten by herbivores than other members of the same species that lack thorns.

C Scientists breed cows that give greater amounts of milk than their ancestors. Scientists breed cows that give greater amounts of milk than their ancestors.

D Female fish that produce more eggs leave more offspring than those that produce fewer eggs.