Problem
C Clever | Portal $\leftarrow \rightarrow$ C 4 ola3.perfor (1) Performance Matters Question 2 of 30 Submit Test Welcome, Ayden! Question 1-2 An experiment is designed to test the effect of ultraviolet (UV) light on frogs. Which of the following groups would be the control group? Frogs exposed to UV light for 30 days Frogs exposed to UV light for 15 days Frogs not exposed to UV light Frogs exposed to UV light for 60 days
Solution
Step 1 ：Determine the control group in an experiment testing the effect of ultraviolet (UV) light on frogs.
Step 2 ：The control group should be the group of frogs not exposed to UV light.
Step 3 ：\( \boxed{\text{Final Answer: Frogs not exposed to UV light}} \)
