How are Mrs. Whatsit and Mrs. Which different? I need the anwser fast !!!

Mrs. Whatsit is wise and good natured, she is youngest of the children’s three guides. She can adopt to different physical forms. Her true nature is “beyond human understanding” while Mrs. Which is the eldest of the three guides. She likes dressing up as a which but she takes her responsibilities serious. She keeps physical distance from the children.