Natural Selection and Darwin

In Darwin’s time most scientists believed that each organism and each adaptation was the work of the creator., but theories began to develop by a number of historians stating that evolutionary changes were an effect to changes in nature. There were many reasons for this, such as geological studies were reveling that the earth was much older than stated in biblical creation. Another reason was the similarities between different organisms. When Darwin traveled to the Galapagos Islands he noticed slight variations that made tortoises from different islands distinct. He also observed from island to island the vast number of finches had slight differences. Darwin also noticed that they all seemed to resemble the main finch on the mainland of Equador. This observation had great influence of Darwin’s thinking and he began to formulate his Theory.

Darwin’s theory of Evolution consists of four main parts. The first one was that organisms have changed over time and the ones living today are different form those of the past also many organisms have become extinct over time. The second part was that all organisms are derived by common ancestors by the branching process. Populations split into different species but they all have one

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These similarities occur because these species have adapted to similar ecological conditions or lifestyles, not because they have a common ancestor.

Convergent Evolution is when two unrelated species share similar traits. An example of this would be found in the crossbreeding of crop plants. Their views changed significantly due to the fact that Darwin had so much evidence and observation to back up his theories. These select few however will be the majority and be the ones to reproduce, their offspring will inherit this insecticide resistance. To prevent this there is a battle to survive and reproduce in which only a few individuals succeed.

C) Convergent evolution and the similarities among species in a particular biome. This part of the theory provided an explanation as to why similar species tended to be in the same geographical area. This shows how variation occurs within natural selection and within the environments that these organisms are located. It fundamentally changed the direction of future scientific thought and people began to question more about our past world. This battle not only exists because of this reason but also because there is only a limited number of resources such as food, water, and light. This is a perfect example of Darwin’s reasoning that parents possessing certain traits that enable them to survive and reproduce will cause the amount of offspring to be disproportionate in the next generation.

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