Natural Selection
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Natural Selection began its origins from Charles Darwin who postulated the idea of "survival of the fittest". Natural Selection is the differential contribution of offspring resulting from variations in heritable traits. So what does this mean???
Basically this means that species adapt and evolve over time to incorporate aspects of their physical traits and characteristics in regards to their environments. In turn this increases reproduction rate, benefits the food chain and so on therefore the species of life begin adapting into ideal creatures.
Sexual selection is the ability of individuals to acquire mates and involves contest between males or choice by females these lead to trails that attract members of the opposite sex. Another way to define sexual selection is the selection of characteristics that increases mating success. For example, according to Knox an experiment was performed in which the tails of male barn swallows were artificially shortened or lengthened and results found that those swallows with longer tails were able to attract more males. The experiment showed how sexual selection favored longer tails...