What is the existence of sociology as an academic area of study based on?

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

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs

Why are some people more concerned about shark survival than about shark attacks?