What is this model about? pls hurry i need an answer

Which process is involved in growing crops? irrigation transportation recreation condensation

If you are in a chronic state of anxiety but also suffer from moment of sudden, intense fear you are problably suffering. from

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