In order to perform carbon-14 dating on an artifact, what must be true? A. The artifact cannot contain any radioactive elements.
B. The artifact must contain only other isotopes of carbon.
C. The artifact cannot contain carbon-14.
D. The artifact must contain carbon-14.

What school are you from and what state are you from?

The difference(s) between the grand canyon and valles marineris is/are: (a) the grand canyon was formed by water, but valles marineris was not. (a) valles marineris is much longer than the grand canyon. (c) valles marineris is much wider than the grand canyon. (d) valles marineris has large volcanoes near it. all of the above

Brian's school locker has a three-digit combination lock that can be set using the numbers 5 to 9 (including 5 and 9), without repeating a number. the probability that the locker code begins with a prime number is %. the probability that the last digit of the locker code is an odd number is %.