3. Several space scientists believe that if they can calculate the half life of the unknown sample they may be one step closer to determining where the sample may be from and possibly, what the sample is. Below is a line graph demonstrating the concept of half life of elements. Using your knowledge of atoms and half life, explain what this graph is showing. What are the x and y axes representing? Give an example of a known element and its half life to help support your answer. Write your answer below in complete sentences.

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