A radioisotope is called a tracer when it is used to
1) kill bacteria in food
2) kill cancerous tissue
3) determine the age of animal skeletal remains
4) determine the way in which a chemical reaction



Answer :

Final answer:

Radioactive tracers, like isotopes, are crucial for studying reactions, substance distribution, and medical applications.


Explanation:

Radioactive isotopes are used as radioactive tracers to follow biochemical reactions, determine substance distribution within organisms, and in medical applications such as diagnosis and treatment. They are also utilized in various fields like agriculture and industry for tracking movements and analyzing processes.


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