An experimenter wanted to test the effects of

cigarette smoking on rats. She infused the
cages of 50 rats with cigarette smoke and the
cages of another 50 rats with pure, clean air.
The rats that received the clean air were the



a. experimental group.
b. control group.
c. model group.
d. predictive group.
e. independent group


B

Biology & Microbiology

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