Cell differentiation<span> is how generic embryonic </span>cells <span>become specialized </span>cells<span>. This occurs 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.
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Answer:
Hello! The answer is A, proteins.
Explanation:
Chromosomes are a part of our human DNA, and they contain cells inside of them. That being said, Proteins can be the only answer. I hope I helped!