The combustion of fossil fuels, such as coal, oil, and gas, have contributed to the steady increase in atmospheric CO? gas over the last 25 years.
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Q31: Which trophic level forms the base of
Q32: Which of the following is a source
Q33: Organisms whose sole source of carbon for
Q34: Chemical elements needed in trace amounts for
Q35: Which of the following organisms anaerobically reduces
Q37: The energy of the sun is converted
Q38: Which of the following statements regarding biogeochemical
Q39: There are very few viruses in aquatic
Q40: Heterotrophs include _.
A) producers only
B) consumers only
C)
Q41: Which microorganism is considered phytoplankton?
A) Nitrogen ?xing
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