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For a study comparing leisure activities of physical education students with those of other students, a researcher has randomly selected a ten percent sample of physical education students and one percent sample of non-physical education students for a list of students. what kind of sampling technique is this?

Compare and contrast the environmental consequences of reliance on coal with reliance on petroleum.

Arrange the following in order from the shortest wavelength to the longest wavelength. visible light gamma rays radio waves x-ray waves microwave infrared