A biologist wants to test the effect of a new food additive on growth in rats. An experimental group was fed a diet containing the additive. Which of the following would be an effective control group?
W) A group of rats that ate a higher concentration of food additive
X) A group of rats that were kept in different conditions across the city
Y) A group of rats that were fed the same ration without the food additive
Z) A group of rats that ate a lower concentration of the food additive
✔️Answer:Y) A GROUP OF RATS THAT WERE FED THE SAME RATION WITHOUT THE FOOD ADDITIVE
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