Final answer:
The endometrium is the structure that can develop in the uterus, while sperm, unfertilized egg, and the prostate gland cannot.
Step-by-step explanation:
In the uterus, one of the things that can develop is the endometrium. The endometrium is the inner lining of the uterus, which thickens each month in preparation for pregnancy. If pregnancy does not occur, the endometrium sheds during menstruation.
On the other hand, sperm cannot develop in the uterus because they are produced in the testes. An unfertilized egg can also develop in the uterus, but it will eventually be shed during menstruation if not fertilized by sperm.
Finally, the prostate gland is not a structure that develops in the uterus. The prostate gland is part of the male reproductive system, located below the bladder and surrounding the urethra.
Learn more about Development in the uterus