9. Why is wearing a few layers of thin clothing better than wearing a layer of thick clothing maintain body temperature?

Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

Why do you think the puppy litter was all dark-haired?

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