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All of the following can be taken in and used by plants except .
Q3: Which of the following would cause a
Q4: are used to remove sulfur oxides from
Q5: Monoculture .<br>A) is a new development in
Q11: Overgrazing by cattle primarily contributes to desertification
Q23: The collapse of a fishery could be
Q31: The United Nations' best estimate is that
Q41: Ocean acidification results in which of the
Q79: Pluto is probably one of the largest
Q115: In general, the less cratered a moon's
Q123: How is energy transfer from the solar