What causes cells to have different functions despite having the same DNA?

This is on the grounds that the entirety of the cells in our bodies start from a solitary prepared egg. With hardly any exemptions, all cells in an individual's body have a similar DNA and qualities. As cells isolate and develop various qualities are communicated, bringing about various cell types.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.