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"Nitrogen-fixing bacteria and nitrifying bacteria convert atmospheric nitrogen into different compounds of nitrogen such as: (a) ammonium lon, (b) ammonia. (C) nitrate ion, and (d) nitrite ion. Which of the following is the correct sequence of formation of the nitrogen compounds?
a. "a, b, c, and d
b. "b, a. d. and c"
c. " b, a. c, and d"
d. "d. a. b, d, and c
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