Who among the following men made the two assumptions in his work on intelligence that: mental abilities develop with age,and that the rate of developmental change is relatively constant for a given individual?

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The two assumptions mentioned are central to Alfred Binet's work on intelligence, specifically his development of the first intelligence test. Sir Francis Galton was more focused on the idea of inherited intelligence, while Lewis Terman and William Stern built off of Binet's work but did not necessarily make these assumptions in their own research.

Who Among the Following Men Made the Two Assumptions in His