Examine the following list of questions. 1. Why are kids afraid of ghosts?
2. Should I feed the raccoons that visit my trash can?
3. How does mouse color affect mouse survival?
4. Does a mother duck love her babies?

Which statement correctly identifies the scientific question and describes why the question is scientific?
Question 1 refers to the supernatural.
Question 2 reflects a moral or social value.
Question 3 leads to a hypothesis that can be tested.
Question 4 reflects a question that can’t be observed.

Researchers randomly divide participants into groups. each group takes a different amount of omega-3 fatty acid supplements daily for a month. one group receives a placebo. the researchers measure the impact on cholesterol levels in the blood. what is the purpose of random assignment in this experiment? a, to produce treatment groups with similar characteristics b, to ensure that all people with high cholesterol have an equal chance of being selected for the study c, to increase the accuracy of the research results and prevent skewness in the data