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Question
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) because it is constantly being bombarded with cosmic rays
D) carbon-14 only starts to decay after the animal dies
E) the carbon-14 levels do not decrease because the carbon-13 in its skin protects it from cosmic rays
Answer
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