Lamarckism is the name that is used to refer to the theory of evolution that Lamarck established in 1809, which he embodied in his literary work which he entitled "Zoological Philosophy", in that text he proposed that the forms of life They had not been created nor did they remain unchanged (as was believed at the time), but instead had evolved from less complex life forms. In addition to this, he established the hypothesis of the conditions that would have led to the evolution of life on earth and also proposed the mechanism through which it would have evolved.
Lamarckism is the first theory of biological evolution, it was nearly five decades ahead of Darwin's formulation of natural selection that he proposed in the book "The Origin of Species."
Initially, an animal similar to an antelope can observe the way in which its environment becomes progressively arid, perceiving how grass and shrubs begin to become increasingly scarce and therefore is forced to resort to feeding on the leaves of trees more often. This fact makes stretching the neck become one of the defining habits in the daily life of some of the members belonging to this species.
In that sense, Lamarck's theory proposes that those pseudo-antelopes that do not fight to be able to feed on the leaves of the trees by stretching their necks, will die, therefore, their offspring will be few or none, On the other hand, those that are They adapt and manage to stretch their necks, they will be able to survive since having their necks stretched out is prolonged. This physical characteristic is transmitted to all their offspring.
Taking into account the above, as time and generations pass, forms of life that previously did not exist appear: as is the case of the giraffe and its physical adaptation to the environment to get food. Despite this, Lamarck's theory is considered an outdated model since today it is known that individuals have a limit of possibilities when modifying their body with its use.
