The ________ includes most of geologic time (87%).

A. Paleozoic Era
B. Mesozoic Era
C. Quaternary Period
D. Cenozoic Era
E. Precambrian


Answer: E

Environmental & Atmospheric Sciences

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Most organic compounds are made up of ________

A) carbon, hydrogen, and nitrogen atoms B) carbon, nitrogen, and water atoms C) carbon, nitrogen, and ozone atoms D) carbon, hydrogen, and oxygen atoms E) nitrogen, oxygen, and carbon dioxide atoms

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Weigh the pros and cons of fracking over nuclear energy

What will be an ideal response?

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What is the best way to deal with pollution?

A. Pollution cleanup only B. Pollution prevention only C. A combination of pollution cleanup and prevention D. The most popular way at the current time E. The cheapest way

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For the following reaction, identify whether the compound in bold is behaving as an acid or a base. H3PO4 + H2O ? H2PO4- + H3O+

A. acid B. base C. neither D. both E. none of the above

Environmental & Atmospheric Sciences