TOEFL Listening: TPO-TOEFL阅读TPO - W9NN4RI23946XI44N$

According to paragraph 1, what distinguishes reinforcement from reintroduction of animal species? A. Only reinforcement involves capturing wild individuals. B. Only reinforcement involves adding individuals to an existing population. C. Only reinforcement requires the use of conspecifics. D. Only reinforcement can help once a population is extinct.