Archaeologists often find only parts of ancient human remains. For example, they may find a small finger bone, called the metacarpal bone. Is it possible to predict the height of a human from the length of a metacarpal bone? To investigate, a researcher measures the heights and metacarpal lengths of 200 modern adults. Which of the following is correct? A the independent variable is height B the independent variable is metacarpal length C the control group is ancient humans. D the control group is modern humans

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