Q. Who gave the use and disuse theory?
Octopus:
A. Hi Subham,The "Use and Disuse" theory was proposed by Jean-Baptiste Lamarck, and in honour of his name, it is also referred to as Lamarckism.......
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http://qna.rediff.com/questions-and-answers/who-gave-the-use-and-disuse-theory/22279175/answers/4283685