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Major Theme Connection: Using radioactive isotopes to determine the age of a fossil is known as radiometric dating. How might radiometric dating provide support for the theory of evolution by natural selection? Hint- Consider the age of fossils with respect to the overall fossil record (the entire collection of data regarding fossils and the age of Earth). 1. Common Thread Connection: Navy coffee is where the coffee is brewed strong and a bit of salt is added. What is special about water that allows you to put sugar or salt in your coffee? To help answer this question, consider the opposite situation: Why do salt scrubs that you buy in a high-end spa consist of large salt crystals in oil? 1.

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