Diachronic change is the "what" that affects constant change on the English language.
Cell differentiation<span> is how generic embryonic </span>cells<span> become specialized </span>cells. Thisoccurs<span> through a process called gene expression. Gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a </span>cell<span> functions.</span>
I think it is D - supporting detail, just a guess tho
Taught by our traditional people
