Which structure is found in some but not all plant cells? a. vacuole b. ribosome c. cell wall d. lysosome

D.lysomsome

Explanation:

The answer is D.

Actually, i took a test on this a long time before, and this was correct. Also i know and feel it is D.

it is either c or d and i know for sure it is not a or b

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.