How to make this plss?​

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

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?

Math focus 4. calculate a map has index contours at 250 m, 500 m, and 750 m. what is the contour interval?