Red Blood Cell:

Similarties: Cell In the human body and have specific functions in the body. 

Differences: Dispereses ocygen throught the entire body. Lacks a cell nucleus

Refrences:http://en.wikipedia.org/wiki/Red_blood_cell

White Blood Cells:

Similarties: are the cell that live in the human body with a specific function/

Diffrences: the number of leuckocytes int eh blood is often an indicator of