Please choose the correct answer to the question: A factory in Japan had been dumping mercury into Minamata Bay. Certain microorganisms in the water were able to change the mercury into a form that the plankton could use. Which most likely happened next?

Answer1: The organisms built up a resistance to the mercury. Answer2: The mercury passed through the food chain. Answer3: The plankton made the mercury safe. Answer4: The fish would not eat the plankton.

Answer format: answer1/answer2/answer3/answer4
Answer: answer2