What is a chromatid? a. a chromosome found outside the nucleus b. a chromosome in g1 of the cell cycle c. a special region that holds two centromeres together d. another name for the chromosomes found in genetics e. a replicate chromosome

e. a replicate chromosome

Explanation:

In the cell that is in the process of division, each condensed chromosome appears as a pair of rods joined at one point, the centromere.  These two chromosomal "halves", called sister chromatids, are identical and arise from the duplication of the original chromosomal filament that occurs at the interphase just before cell division begins.

During the process of cell division, the sister chromatids separate: each chromatid migrates to one of the forming daughter cells.

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.