Answer :
Lamarckism, a theory of evolution based on the idea that physical changes in organisms during their lives, such as greater development of an organ or a portion due to increased use, could be passed on to their offspring.
Lamarck claimed that organisms changed how they behaved in response to environmental change. Their altered behaviour caused their organs to undergo modification, which their progeny inherited.
One of the most well-known early evolutionists was Jean Baptiste Lamarck (1744–1829). They instead evolved into different species. Lamarck believed that since primitive organisms coexist with complex "advanced" species today, spontaneous generation must be the source of their ongoing creation.
Organisms changed their behaviour in reaction to environmental change, according to Lamarck.
Their altered behaviour caused their organs to undergo modification, which their progeny inherited. For instance, giraffes evolved their long necks and front legs over many generations of leaf-chewing on tall trees. Stretching up to the leaves changed the neck and legs, and these new traits were passed down to their progeny.
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