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The form of nitrogen used by plants to produce various amino acids,proteins,nucleic acids,and vitamins is ____.
Q10: E-waste can be recycled to extract _.<br>A)
Q21: Which of the following does not belong
Q26: Technological fixes,such as being more efficient in
Q32: _ is the leading cause of death
Q49: In stage _ of demographic transition,birth rates
Q60: Which term describes the temperature,precipitation,and humidity of
Q61: Life on the earth depends on interaction
Q77: There has been almost no well-organized movement
Q89: Many of the world's amphibian species are
Q90: About _ percent of the world's major