Final answer:
The nurse would expect the client's cervical os to appear circular or round on examination after giving birth to two living children.
Step-by-step explanation:
The nurse would expect the client's cervical os to appear circular or round on examination. During childbirth, the cervix dilates and thins to allow the passage of the baby. After giving birth to two living children, the client's cervical os would have experienced several rounds of dilation and is likely to appear circular or round in shape.