1) - Scientists performed an experiment to determine whether at hand is a connection between study ability and food. They took two groups of 20 mice respectively, all from like purebred strain. The mice were deprived of food for 3 days and afterwards given a standard learning session contained by running through a maze. They be trained by giving them a mild electric shock whenever they took a wrong turn. Immediately after each study session, one group of mice was feed, but the other was not, A week subsequent, all of the mice be tested to see whether they could still run the maze correctly. The group that have been feed had retained this wherewithal, but the other group had not. The probable apology that the scientists used only mice from duplicate pure-bred strain is so that?
A) the experiment could be repeated with like mice
B) genetic differences would not affect the outcome of the test
C) the mice would adjectives be the same color
D) the mice would adjectives be the same size
The mice that be not fed be the control of the experiment. To ensure that there be no other factors contained by the mice that could change the experiment the mice have to be the same. If different breeds of mice be used the experiment could be considered unreliable.
(B)
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