What set of simple machines would be needed to create the complex machine shown here? A) gears, wedge, lever B) screw, lever , and wedge C) gears, screw, wheel and axle D) wedge, pulley, inclined plane

What do heterotrophic cells need to survive?

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

Name the glands associated with human digestive system