Identify the type of blood vessel shown below. How does its structure match its function?

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

What percentage of light hits earth's surface directly?

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?