Learning to stay close to familiar persons, evolutionarily speaking, helps infants to ______

What is the name of the procedure in which an incision is made to make the vaginal opening larger?

a. crowning b. episiotomy c. vaginalectomy d. amniocentesis

Symptoms of posttraumatic stress disorder must last at least for a diagnosis to be made

a. one month b. three months c. six months d. one year