TOEFL Listening: TPO-TOEFL阅读TPO - 1NYI859P4L58H8AHN$

According to paragraph 1, what is one effect of competition among individuals of different species? A. It results in the eventual elimination of the resource for which they are competing. B. It leads to competition among individuals of the same species. C. It encourages new species to immigrate to an area. D. It controls the number of individuals in the competing populations.