40. The validity of scientific theories and laws depends on evidence. Which of the following
statements of evidence supports a law rather than a theory?
A. Electrons orbit the nucleus of an atom within a certain radius.
B. DNA analysis reveals that a modern species is related to an extinct species.
C. Seafloor spreading occurs at a rate of three centimeters per year in the mid-Atlantic.
D. The amount of matter in a closed system is the same at the start of a reaction as at the end of
the reaction.