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(D) Nitrifying bacteria are chemoautotrophic organisms that oxidize ammonia to nitrites and then to nitrates. $1$. Ammonia $(NH_3)$ is oxidized to nit

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Both $B$ and $C$

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(D) Nitrifying bacteria are chemoautotrophic organisms that oxidize ammonia to nitrites and then to nitrates. $1$. Ammonia $(NH_3)$ is oxidized to nitrite $(NO_2^-)$ by bacteria such as $Nitrosomonas$ and $Nitrococcus$. $2$. Nitrite $(NO_2^-)$ is further oxidized to nitrate $(NO_3^-)$ by bacteria such as $Nitrobacter$. Since both steps are part of the nitrification process,the correct answer is that they convert ammonia into nitrites and nitrites into nitrates.

Nitrifying bacteria are those which can convert

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