Answer:
Some minerals in rocks and organic matter (e.g., wood, bones, and shells) can contain radioactive isotopes. The abundances of parent and daughter isotopes in a sample can be measured and used to determine their age. This method is known as radiometric dating.
Explanation:
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Houses were being burnt down so people would have to build their own.
The last one is the answer.
A wealthy individual who gives much of their fortune to good causes. Bill Gates can be considered as one.
