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Compare Darwin's Theory Of Evolution To Lamarck's Theory Of Evolution

614 words - 2 pages

There have been many theories explaining evolution. Two of the most well known of these are the Lamarckian theory, which was mostly believed before the Darwinian theory, which is the theory which is believed to have the highest probability of it being the case. In Lamarck's theory of evolution, he stated that an organism was able to pass on required traits to their offspring. This theory is commonly shown through the giraffe's evolution to having longer legs and a longer neck. According to Lamarck's theory, during a bad season when all the vegetation in lower areas (easily reachable by the giraffe with the shorter neck and legs) had gone, the giraffes were forced to stretch their necks, to reach for food on a higher level. These giraffes would then have longer necks and would pass this trait of having a longer neck to their offspring. Lamarck's theory then states that over time, each generation will pass on their traits of having a longer neck than the previous generation, accounting for the evolution of the giraffe from being an animal with a shorter neck and legs, to one seen today with its long neck and legs. Darwin's theory relied on a process of natural selection. In his theory, at the start there would have been many giraffes of varying heights, which would be so due to the variations in organisms through the process of sexual reproduction. Darwin stated that all life competes in a struggle to exist. Therefore, during a dry season when there is not as much nutrition available on lower levels for the shorter giraffes, the giraffe's that are more likely to survive are the ones with...

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