TOEFL Listening: ETS-TOEFL听力机经 - V844IAT31Q6S56L6P$

What was the goal of the research study that the professor describes? A. To develop a way to grow crops that are resistant to 2,4-D B. To create a new herbicide that is more effective than glyphosate C. To identify two of the bacterial enzymes that are present in 2,4-D D. To understand why certain plants are particularly vulnerable to herbicides