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In an experiment investigating the effects of lead on the nervous system of rats, theexperimental...

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In an experiment investigating the effects of lead on the nervous system of rats, theexperimental group received a measured amount of lead in their drinking water each day.Control rats were given water from which all lead had been removed. For valid results, all ofthe following are necessary EXCEPTThe rats should eat the same kinds and amounts of food.The control rats should receive water fortified with other minerals to make up for the missing lead.The experimental and control rats should be the same age and have the same body weight.The rats should be housed under the same conditions of temperature and humidity.The rats should be members of the same breed.

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