Write any two concepts of Lamarckism.
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Two basic concepts of Lamarckism are as follows:-
1. Effect of environment and new needs:- Environment influences all type of organisms. Changing environment gives rise to new needs. New needs means desires to produce new structures that is known as doctrine of desire or appetency. Also change in habits of the organism.
2. Use and disuse of organs:- lf an organ is constantly used over generations, it would be better developed. Whereas disuse of organ results in its degeneration that is called vestigial organs.
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