1) You started life as a single cell; keep in mind Virchow's statement that all the cells come from pre-existing cells. Where did your original Cell come from?
2) Where did your parent's cells come from?
3) Your body is now composed of trillions of cells. Where did the rest of your cells come from?
4) If all cells come from pre-existing cells, then all the cells should be related. What evidence can you cite to support this statement?