TOEFL Listening: ETS-TOEFL听力机经 - 5SW710624K5N4Y32P$

How is tetrodotoxin different from other animal toxins? A. It is equally toxic to all animals that come into contact with it. B. When heated, it can be safely consumed by people. C. It is poisonous only when combined with sodium. D. It is found in several different species of animal.