Final answer:
Dale is experiencing a nocturnal emission, or wet dream, which is a typical sign of puberty and signifies the beginning of sexual maturity in boys.
Step-by-step explanation:
Dale, a 12-year-old boy, is experiencing a common event known as a nocturnal emission or wet dream, which is a part of the process of puberty. During puberty, adolescents undergo a series of physical changes, including sexual maturation which leads to the ability to reproduce. One of the hallmarks of male puberty is the start of ejaculation, where sperms are released from the body during orgasm. It is noted that the first ejaculation generally occurs around the age of 13, indicating that Dale is within the typical age range of this developmental milestone. Even though boys may not reach full fertility until a few years later, ejaculation signifies the commencement of sexual maturity, and in some cases, early fertility even before the completion of adolescent growth.