neoteny

/niˈɑːtəni/
noun
  1. The retention of juvenile features in an adult animal or plant, often due to slowed or delayed development.
    • The concept of neoteny helps biologists understand how certain species adapt to their environments.
    • Human evolution shows neoteny in our large skulls and small jaws compared to other primates.
    • Neoteny explains why some amphibians, like the axolotl, never undergo full metamorphosis.
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