sentences:  With the evolutionary change of the reduction of the pelvis and enlarged cranial capacity; events like childbirth are dependent on a safe, social setting to assist in the childbirth and a birthing mother will seek others when going into labor.This is a uniquely human experience, as other animals are able to give birth on their own and often choose to isolate themselves to do so to protect their young.An example of a genetic adaptation unique to humans is the gene APOE4 on chromosome 19.