In an experiment investigating the effects of lead on the

Last updated: 8/7/2022

In an experiment investigating the effects of lead on the nervous system of rats, the experimental 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 of the following are necessary EXCEPT The 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.