Answer:
the answer is cancle filter
A,C,D Is the answer to the question
If want a direct answer it would be the decrease in mice, but if you want to get technical the decrease in grain spills caused mice to leave so that would be the indirect cause
Picture attached
Answer:
Nitrifying bacteria
Explanation:
The process labelled B is the conversion of inorganic nitrogen from organic products to atmospheric nitrogen. This process is called denitrification.
Denitrification is a process where nitrate is reduced to molecular nitrogen through a series of intermediate products. This processed is carried out by bacteria called denitrifying bacteria.
Denitrifying bacteria are an important part of the nitrogen cycle.