When a scientist contrasts two or more objects what is he or she looking for?

A. differences

B. causes and effects

C. changes

D. errors

When a scientist contrasts two or more objects, he or she is looking for their differences. The answer is letter A. Suppose that the color of the apple is red and the color of the green apple is green. The scientist will determine that their difference in color is based on the pigment the fruit has.