DISCUSSION: There were multiple proposed causes: brevetoxin, PCBs, bacteria. You need to find one mentioned by both theories.
___________
- Only the researchers mentioned the dolphins’ diet (lines 29-31).
- The dolphins died off the Atlantic coast; the researchers never mentioned the Gulf of Mexico. The author mentioned that P. brevis in the Gulf of Mexico didn’t kill dolphins (lines 42-44).
- The author points out that the dolphins started dying before the red tide (lines 45-47).
- CORRECT. The researchers mention PCBs on lines 35-37. The author mentions pollutants on line 53-56. The author specifically names PCBs as harmful on lines 49-51.
- The author’s alternative explanation on lines 52-60 does not mention bacteria.
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