How come an animal's carbon-14 levels do not start to decrease until it dies?
A. because it constantly replenishes its carbon-14 supply by eating plants with carbon-14 in them
B. because it constantly replenishes its carbon-14 supply by breathing air with carbon-14 in it
C. carbon-14 only starts to decay after the animal dies
D. The carbon-14 levels do not decrease because the carbon-13 in its skin protects it from cosmic rays.
E. because it is constantly being bombarded with cosmic rays
Answer: A
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