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Horseshoe crabs have lived in the earth's oceans for ____ years.
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Q25: Due to biological magnification, which would have
Q37: Crater Lake in Oregon formed as a
Q41: Anaerobic methanogens produce _.<br>A) carbon monoxide<br>B) carbon
Q45: Which form of the monarch butterfly makes
Q45: Most of the Earth's phosphorous is in
Q66: In the universal ABO blood grouping system,
Q68: Which of the following invertebrates is most