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Biology 17 Online
OpenStudy (anonymous):

What did Milankovitch propose as the main cause of ice ages? A collision with a large meteorite may have contributed to the mass extinction at the end of the _____ era? During the Silurian period, the first animals to adapt to life on land were?

thomaster (thomaster):

Please post 1 question at time. Also these look like geography questions. We hava special section for those question You can find it by clicking on "Find More Subjects" and select geography.

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