3 simple essay questions.

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read the questions, answer all of them. less than one page each question.

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You will have 1-page to answer the essay question.
1) How do chlorofluorocarbons degrade ozone (write out reaction)? Describe how this
degradation leads to negative consequences for organisms on Earth.
2) Describe how geologists assess relative and absolute time. Be sure to mention all of
the principles related to relative timing and provide a brief description of each.
3) Describe how the emergence of organism with hard parts aided our ability to
characterize and identify evolutionary trends in Earth history. When did hard parts first
appear and in what organisms?

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