Which is an outcome of gene regulation?

In eukaryotes, the accessibility of large regions of DNA can depend on its chromatin structure, which can be altered as a result of histone modifications directed by DNA methylation, ncRNA, or DNA-binding protein. Hence these modifications may up or down regulate the expression of a gene.

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they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

the sphincter muscles at the end of the digestive tract is the anus.