Final answer:
The statement suggesting a problem arises when animals are marketed before reaching puberty is false. Animals can be sold at different developmental stages, but breeding animals must reach sexual maturity to reproduce successfully. Puberty is an essential phase where hormones lead to reproductive maturity and secondary sex characteristics.
Step-by-step explanation:
The statement, 'The problem with sex occurs when animals are marketed before they reach puberty,' is false. Animals can be marketed and sold at various stages of development, but the potential issues related to sexual maturity primarily involve breeding considerations rather than marketability. Marketing animals before they reach puberty could be a strategy in various industries. However, animals that are intended for breeding purposes must reach sexual maturity to effectively reproduce.
Puberty is a crucial developmental stage at which individuals become sexually mature. Hormones such as GnRH, LH, FSH, testosterone, or estrogen play a pivotal role in this process. They are responsible for the maturation of the reproductive systems and the development of secondary sex characteristics which include features like the growth of body hair and, in females, the development of breasts.