Darwin's theory of natural selection was based a couple different things. First, that organisms increase more rapidly than their food supply.. Due to limited resources, all life forms struggle to survive, but only the superior ones survive. Those individuals that possess some characteristic that is useful in adapting to the environment increase their chances of survival, and produce more offspring with the favorable characteristic and pass them to the next generations. Due to the variations in characteristic and physical changes, the new individual will eventually become so distinct that they will constitute different specie.
Sexual selection is an important aspect that depends usually on a struggle between the males for the females. Victory depends on special traits. For example: a hornless stag would not have a good chance of leaving offspring. Sexual selection also involves attracting females by show or aesthetics. Like the male peacock displaying their large colorful feathers and performing strange antics in front of the females, who choose the most attractive partner for them. Darwin believed that when the males and females of any animal have the same general habits of life, but differ in structure, color, or ornament, such differences have been mainly caused by sexual selection.
Darwin illustrates the action of natural selection in various ways. A weak wolf can still survive, if the number of dear increase in its territory. Cats have a tendency to catch rats... [continues]
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