Which statement best describes the overall change that occurs as a result of mitosis? one cell becomes two cells that have identical copies of dna. one cell becomes two cells that have different copies of dna. two cells become two cells that have identical copies of dna. two cells become two cells that have different copies of dna.

The answer is actually one cell becomes two cells that have identical copies of DNA

Option A, One cell becomes two cells that have identical copies of DNA.

Explanation:

Mitosis is the cell division process in which a parent cell divides in order to produce  two daughter cells that are exactly similar to the parent which means that the genetic material of daughter cell is identical to the genetic material of parent cell.  

Mitosis is the most simplest form of cell division. It usually takes place in order to make multiple copies of a cell in short period of time.

Hence, option A is correct

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.