For a living organism, which of the following are true? Select all that apply.
A. The ratio of C-14 to C-12 remains constant.
B. The ratio of C-14 to C-12 increases over time.
C. The ratio ...
... of C-14 to C-12 decreases over time.
D. The amount of C-14 is less than the amount of C-12.
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