There are various evolution methods, including the Lamarckism theory, the theory of natural selection, the mutation theory, and the Neo-Darwinism theory of evolution. The Lamarckism theory focuses on inheritance, whereby individuals inherit characteristics due to environmental changes and fulfill their new needs. These individuals also have characteristics that they do not require. Darwin’s theory of evolution states that organisms develop over time through natural selection of specific traits, increasing the individual’s ability to survive and compete. The mutation theory states that species are formed due to the unexpected development of changes in their defining characteristics. Neo-Darwinism theory of evolution explains the origin of species through genetics. The scientific theory of evolution states that living things in the world originate from preexisting things and the unique variations are due to the various alterations in consecutive generations.
The Lamarckism theory is valid, and this can be proved through various pieces of evidence that favor the Lamarckism theory. The phylogenetic study of horses and other animals shows how they have changed their evolution from simple to more complex forms. The giraffes have long necks from their initial deer-like bodies (Barbieri,2019). Gradually, their necks became elongated due to the lack of food, and their body parts had to be long to eat the leaves on the tall tree branches. Giraffes are, therefore, an example of extra needs where they need to eat leaves on tree branches.
The mutation theory of evolution is valid, and there are various evidences in favor of this theory. The first evidence is the appearance of sheep with short legs in 1791. The appearance of hornless cattle also developed as a mutation from the homed cattle. Progressive and retrogressive evolution also explains the mutation theory (Svensson,2019). The theory is also valid because it presents the inheritance of vestigial organs. The theory is also valid because mutations are the foundation of all disparities and are, therefore, the head of evolution.
Darwin’s theory of evolution is valid, and the evolution of whales can explain this from land to water. The blowhole evolution might have begun with sudden genetic changes, which resulted in one whale having its nostrils on its head. These whales were well suited for marine life since they did not have enough surface to breathe. In later generations, more genetic changes occurred, which included moving the nostrils further behind the head. Other parts that changed include the front legs and flippers; the back legs disappeared, and their bodies became more streamlined. The whales also developed tail flukes which helped them to propel themselves in the water.
Neo-Darwinism is valid, and this can be explained through how evolution is gradual and can be explained through the small genetic changes in populations over time. The genetic disparities in populations arise by chance through mutation. These genetic disparities lead to phenotypic variations among species members (Czachesz,2018). Evolution mainly consists of the variations in the frequencies of alleles between a single generation and another one due to natural selection. The creation of a new population is a process that occurs as the species become more diversified due to isolation.
The scientific theory of evolution can be proved through fossil records. Various paleontologists have studied the fossil remains of organisms in the past. These records show that many kinds of extinct species are different from any living thing. The fossil records also show a succession of species through time.
In conclusion, the various theories of evolution are valid, and this is due to the multiple pieces of evidence presented above. The giraffes have developed long necks from their initial deer-like bodies; this proves the Lamarckism theory of evolution. The appearance of hornless cattle developed as a mutation from the homed cattle proves the mutation theory of evolution. The evolution of whales from land to water explains the theory of natural selection. Various fossil records also confirm the validity of the scientific theory of evolution.
References
Barbieri, M. (2019). The semantic theory of evolution. Routledge.
Czachesz, I. (2018). Evolutionary theory on the move: New perspectives on evolution in the cognitive science of religion.
Svensson, E. I., & Berger, D. (2019). The role of mutation bias in adaptive evolution. Trends in ecology & evolution, 34(5), 422-434.
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