Final answer:
Two anatomical structures present in male pigs but not in females are the testes and scrotum, which are part of the male reproductive system.
Step-by-step explanation:
These are the testes and the scrotum. The testes are responsible for the production of sperm and reproductive hormones, while the scrotum is the pouch that houses and protects the testes. Unlike male pigs, female pigs do not have these structures; instead, they have ovaries and a uterus associated with the female reproductive system.
These structures develop as a result of the presence of testosterone in male fetuses, leading to the differentiation of homologous tissues into the scrotum and testes. In the absence of testosterone, these tissues would develop into the labia and ovaries in females.
As part of an in-depth response, it is also worth mentioning that other structures such as the epididymis, seminal vesicles, and the prostate gland are key components of the male reproductive system but are not present in females.