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a group of scientists believe that a pigment found in red vegetables cells to live longer. they test their theory by injecting this pigment into live cells growing in a test tube. after two days, the scientists count the number of healthy cells in the test tube and compare the results to a tube of cells that did not receive an injection of this pigment. what is a limitation of this experiment? a. the study does not have a hypothesis. b. the study does not have a control group. c. the study does not show cells in their natural environment. d. the study does not have a measurable way to show change.