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The theory of natural selection is the process by which species evolve and adapt to their environment through the preservation of favorable heritable traits. This theory was formulated by Charles Darwin in his book “On the Origin of Species” in 1859.
According to the theory, individuals within a population vary in their traits. These traits can be inherited and passed on to the next generation. Some traits may give individuals a better chance of surviving and reproducing in a given environment, while others may be detrimental.
In a population with limited resources and competition for survival, individuals with favorable traits have a higher chance of survival and reproduction. This means that they are more likely to pass on their genes to the next generation. Over time, these favorable traits become more common in the population, while less advantageous traits become less common or even disappear.
The process of natural selection is driven by four main factors: variation, heritability, competition, and differential reproductive success. Variation refers to the differences between individuals within a population. Some individuals may have traits that make them better suited to their environment, while others may not. Heritability refers to the ability of traits to be passed on from one generation to the next.
Competition arises from the scarcity of resources or other environmental pressures. In order to survive and reproduce, individuals must compete for these resources. Individuals with favorable traits are more likely to succeed in this competition and pass on their genes.
Differential reproductive success refers to the fact that individuals with favorable traits are more likely to reproduce and pass on their genes. This leads to an accumulation of these traits in the population over time.
Overall, natural selection is a process that allows species to adapt and evolve over time. It leads to the development of traits that increase an organism’s chances of survival and reproduction in its specific environment.
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