Which of the following statements best characterizes the risk of ground-level ozone and air pollution? A. It contaminates the food supply.
B. It contaminates the water supply.
C. It is very harmful to human health.
D It disrupts the food chain in lakes.

Micah is studying child behavior in playgrounds throughout the world. he wants to see how the children react when teachers select the same child to be the first to use each piece of equipment. which approach is micah is using?

Which is relatively better: a score of 76 on a psychology test or a score of 22 on an economics test? scores on the psychology test have a mean of 90 and a standard deviation of 13. scores on the economics test have a mean of 52 and a standard deviation of 10.

Aregion home to ancient civilization