In a mitotic cell, why are the two chromatoids of each chromosome genetically identical

They are genetically identical because when the cell splits into the daughter cells, it makes an exact copy of DNA chromosomes, forcing the cells to be identical. 

1) the mayans built pyramids just like the egyptians. the mayans also used hieroglyphics like them.2) power was passed down by family. for example, if the father dies, the son would be the next king.3)they both built pyramids for their structures.4)the main crop for the mayans was maize.5)they also grew manioc, beans,  squash,  amaranth, and chile peppers.

C) to ensure each new cell has an exact copy of the dna