level 4\nwhich shows the correct pathway for nitrification?\na. ammonium → nitrite → nitrate\nb. ammonia →…

level 4\nwhich shows the correct pathway for nitrification?\na. ammonium → nitrite → nitrate\nb. ammonia → nitrite → nitrate\nc. ammonia → nitrate → nitrite\nd. both a and b

level 4\nwhich shows the correct pathway for nitrification?\na. ammonium → nitrite → nitrate\nb. ammonia → nitrite → nitrate\nc. ammonia → nitrate → nitrite\nd. both a and b

Answer

Brief Explanations:

Nitrification is a two - step process in the nitrogen cycle. First, ammonia or ammonium is oxidized to nitrite by ammonia - oxidizing bacteria. Then, nitrite is oxidized to nitrate by nitrite - oxidizing bacteria. Both ammonium and ammonia can be starting substances for nitrification.

Answer:

D. Both A and B