Final answer:
Stretch marks, or striae gravidarum, are changes to the integumentary system during pregnancy that commonly persist after birth as they do not disappear completely.
Step-by-step explanation:
The question asks which change in the integumentary system persists after birth. During pregnancy, the integumentary system undergoes several changes to accommodate the growing fetus. One of these changes is the formation of striae gravidarum, commonly known as stretch marks. These marks appear as the dermis stretches to accommodate the growing uterus, breast tissue, and fat deposits on the thighs and hips. The torn connective tissue beneath the dermis causes stretch marks on the abdomen, which appear as red or purple marks during pregnancy. Over time, these fade to a silvery white color, but they often persist after childbirth and do not disappear completely. Therefore, the answer is d. Striae gravidarum.