Consider this animal cell. The organelles in an animal cell are labeled. Part E represents small dots on the nucleolus.

What is the function of the small, dark organelles labeled E?
They contain enzymes for the digestion of old cell parts.
They regulate what enters and leaves the cell.
They produce proteins for the cell.
They store water and other materials.

They produce proteins for the cell.

Explanation:

Ribosomes produce proteins.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.