47 year old woman comes to the physician because of right wrist pain that began 2 days ago when she fell on her outstretched arm while playing tennis nbme form 1 family medicine

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

Environmental impacts on evolution : mastery test

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi