February 25, 2017

Homework Help: science

Posted by emily on Thursday, April 9, 2009 at 8:42am.

ok i have a couple questions.
1. How has life changed throughout Earth's history?
2.What are three things that fossils tell us about earth's past?
3.What is radioactive dating? how do scientists use parent and daughter elements to determine the age of a fossil?
4.What is relative time/age? What are examples of relative time?
5.How do fossils form? Where are fossils generally found?
6.How is Earth today different (2 details) than Earth during the Precambrian Era?
7.What is and index fossil? How does an index fossil relate to the law of superposition?

Thank you for your help!!

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