Natural resources a. are inputs provided by nature. b. include land, rivers, and mineral deposits. c. take two forms: renewable and nonrenewable. d. All of the above are correct.

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 substance acts to prevent sudden ph changes in bodily fluids?

To confirm when to exclude children from school it’s recommended that you refer to guidelines from which of the following organizations