TOEFL Listening: TPO-TOEFL阅读TPO - YQ0W43124D8OH948N$

According to paragraph 2, which of the following is true of the action of natural selection on hosts and parasites? A. Hosts benefit more from natural selection than parasites do. B. Both aggression in predators and defensive capacities in hosts are favored for species survival C. The ability to make toxic chemicals enables a parasite to find and isolate its host D. Larger size equips a parasite to prey on smaller host organisms.