Serena took her little sister to a museum that had some dinosaur bone fossils.

Serena took her little sister to a museum that had some dinosaur bone fossils. The exhibit

sign said these bones were 70 million years old. Her little sister asked, “How do we know
how old these bones are?” Based on what you learned in this lesson, what should Serena tell
her sister? Your response must contain detailed information and examples.

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