Definition Of Natural Selection
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The theory of natural selection was explained and found by Charles Darwin, who was an English naturalist. Darwin dedicated his entire life in studying the theory of evolution and all the other associated theories. His contribution to the science of biology is immense, and even today, his theory of natural selection is the most respected theory of all.
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Darwin described the theory of natural selection as a process that results in the adaptation of the organism to its own environment through selecting the changes required for the survival through reproduction. Every single organism, whether it is a microorganism like bacteria or human beings, reproduces. Only by reproducing can the organism ensure its survival and propagation of its genes. The changes and variations in the genes are essential because they increase the chances of survival for the living being.
The environment is constantly changing due to development and several other factors. So, if living beings do not change according to the environment, then they cannot adjust to the change. This can cause undesirable conditions for the existence of that particular living being, and force them to stop reproducing. They stop growing in numbers, and they soon become extinct.
The natural selection is a process through which evolution takes place; whether it is a totally new living organism, or it is something that is not found anymore. All these are a result of the process of evolution. For example, today we see dogs and cats. However, their ancestors looked very different because they lived in different environmental conditions. These animals have become much smaller in size. The changes in size are a result of evolution.
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