The concept of developmental stages came from Darwin's theory of evolution.

Name: The concept of developmental stages came from Darwin's theory of evolution.
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The concept of developmental stages was first proposed by the German biologist Ernst Haeckel in 1866. Haeckel's theory was based on the idea that all animals, including humans, go through a series of developmental stages that are similar to the stages that their ancestors went through during evolution.

The Concept of Developmental Stages Came from Darwin's Theory of Evolution