Please help me im really stuck and tryna finish this

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

Me . based on the data in your tables, did the light-colored moths have a higher or lower survival rate after the industrial revolution?

Identify the area on the image where the force of attraction is the strongest.