What causes the moon to change phases throughout the month? explain

The moon does not physically change its shape. As it orbits the Earth, it goes through phases, and sunlight and shadows create a slightly different look each night. It takes about one month for the moon to completely cycle through its phases  

the concept of nucleosome occupancy, which reflects the fraction of cells from the population in which a given region of dna is occupied by a histone octamer

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