Two students are planning an experiment that will test how planaria (aquatic flatworms) respond to...

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Two students are planning an experiment that will test how planaria (aquatic flatworms) respond to different environments. They will conduct two investigations-one that tests the worms' responses to different water temperatures and one that tests the worms' responses to different levels of acidity. Student 1 wants to buy two groups of flatworms and use a different group for each investigation. Student 2 thinks the same group of worms should be used for both investigations. Do you think either student's method would give more accurate results? Why or why not? Explain your response.

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