When animal cells undergo cell division, several cellular structures aid the the movement of chromosomes into the two new daughter cells. what are these cellular structures? a) dna and the resulting transcribed rna. b) nucleolus and the proteins it produces. c) centrioles and the spindle fibers they produce. d) smooth er and the proteins produced and packaged there.

and i oop

explanation:

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.