How does the skin protect the body against illness? Check all that apply.
The skin produces sweat and oil.
The skin acts as a barrier.
The skin identifies and coordinates an immune response.
The skin produces mucus.
The skin causes the body to produce antibodies.

*the skin produces sweat and oil.*
*the skin acts as a barrier*

What is it called when plants lose water though their leaves

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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