Sarah observed that the mystery pond organisms never come up to the pond's surface. If she catches one of these organisms and observes closely, perhaps dissecting the organism, she should find

Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

How will you manage your time to accomplish the necessary tasks both on the job and at home?