TOEFL Listening: ETS-TOEFL听力机经 - LHH3813I7UZF6484P$

What does the professor imply about the biological costs of relocating wildlife? A. The biological costs can be eliminated with careful planning. B. The benefits almost always outweigh the biological costs. C. It may be difficult for scientists to anticipate all of the biological costs. D. There have been minimal biological costs involved to date.