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Students believed that salt water would have a negative effect on hydra locomotion. They placed 100 hydra in a 10 percent solution of salt water and observed them over the course of a week. What was missing from their experiment?

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Students believed that salt water would have a negative effect on hydra locomotion. They placed 100 hydra in a 10 percent solution of salt water and observed them over the course of a week. What was missing from their experiment?






 
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