The answer for that question is a
That would be the Endoplasmic Reticulum my good friend hope this helped... :D
D). Beliefs are not scientific.
In genetics, gene expression is the most fundamental level at which the genotype gives rise to the phenotype, i.e. observable trait. ... Such phenotypes are often expressed by the synthesis of proteins that control the organism's structure and development, or that act as enzymes catalyzing specific metabolic pathways.
It would be “c” ; nitrogen fixation
