A four-and-a-half-year-old is playing a game with her father. The rules say that each person picks up two cards and sees if they
match. Then it is the other person's turn. The child picks up two cards and sees that they do not match. Then she picks up another card and smiles because she has a match. What is the father's best response? The father decides to monitor her playmates more carefully to learn where she is picking up bad habits.
The father decides not to put emphasis on winning, as children this age are not ready for competition.
The father decides to nip the behavior in the bud by placing the child in a one-minute time out.
The father realizes that she is too young for games with rules and decides to put the game away until she is older.
The Immune system is a complex network of cells (such as lymphocytes) and organs that work together to defend the body against foreign substances (antigens) such as bacteria, a virus or tumor cell.
