Chemical modification of histones regulates which stage of gene expression?

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the last one: artificial selection/genetic engineering

plant breeding is modifying the genetic composition of the plant - but this isn't cloning (which is specifically introducing a gene into a genome). but you are artificially selecting for the phenotype that you want.

the second one is literally genetic engineering - the gene would have been cloned first and then inserted or genetically engineered into the new plant cell (the cotton).

look at this it will give you up to 17 answers  

answer; the code in musculoskeletal system subsection is associated with deep tissue possibly to the bone;