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Testing For Radioactivity in Organisms

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Remember the nuclear accident at Chernobyl (former Soviet Union - now the territory of Ukraine) in 1986?

A scientist suspects that the food in a nearby ecosystem may have been contaminated with radioactive nitrogen over a period of months.

Which substances in plants and animals could be examined for radioactivity to test his hypothesis?

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This question relates to the fact that nitrogen is naturally found in two main types of compounds in plants and animals - ...

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