Heterochrony is the process in which the rates of developmental events are altered among different individuals within a species. This results in morphological changes in the form of ontogeny, or the process from embryo to adult. It is often divided into three categories: paedomorphism, where juvenile characteristics are retained into adulthood, neoteny, where the rate of development slows and fewer structures are lost, and progenesis, where an adult trait develops earlier in ontogeny.
Explain the definition of the term "heterochrony"