Posted by **SHAZAM** on Friday, January 7, 2011 at 2:02pm.

Four groups of rats are tested in a lab. Group 1 is given a special hornmone for muscle growth. Group 2 is given a special multivitamin diet. Group 3 receives both the hormone treatment and the multivitamin diet. Group 4 does not receive any extra treatment or special diet. which of the groups is the control group for this experiment? Explain your reasoning.

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