Variation is essential for evolution to occur from "summary" of The Descent of Man by Charles Darwin
As we examine the process of evolution, it becomes evident that variation plays a crucial role in driving the changes that lead to the development of new species. Without variation, there would be no raw material upon which natural selection could act. Variation, therefore, is the starting point from which evolution unfolds. In the natural world, we observe that individuals within a species display a wide range of characteristics. These differences can be attributed to variations in genetic makeup, environmental influences, and other factors. It is this diversity that allows some individuals to thrive in their environment while others may struggle to survive. Through the mechanism of natural selection, those individuals with traits that are better suited to their environment are more likely to survive and reproduce, passi...
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