John counted 20 heartbeats in ten seconds. what is his heart rate?

What fraction of high school seniors in the united states admit to drinking alcohol

When lifting heavy loads off the ground, the majority of the weight should be lifted by which of the following? a. arms b. legs c. back d. stomach

What is one way that cold and flu viruses spread? a. by transfusing contaminated blood b. by inhaling contaminated droplets c. by eating contaminated meat d. by drinking contaminated water