Earth's Biologic History

We have PASS testing in less than a week, and there will be several questions about Earth's history on that test.  We obviously cannot learn it all in just a few days, so I just want you to make the most logical guesses you can when it comes to questions about earth's biologic history. 

We will continue to learn all about these topics even after PASS testing.  Just because the test is finished, it doesn't mean our year of learning is!  :0)   We have sixteen days left!

For now, you will have a simple introduction to some of the major ideas, and we will go deeper into each topic together in class.

Trilobite - One of the earliest known sea creatures - This one was found in Russia and was alive 500 million years ago.	Cambrian Ocean Floor Life
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