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Several billion years ago which gas was the least prevailant in the atmosphere

(6.02 mc)what affect do marine protected areas have on environmental quality? they increase environmental quality by preventing resource overuse. they increase environmental quality by adding new species. they decrease environmental quality by removing all human activity. they decrease environmental quality by adding recycling facilities.

Has anyone taken the genetics unit test in connexus? not looking for answers, just a little bit what to expect and some with studying.