"Birds that survived in arid environment, the ones that had beaks were best suited for that particular environment and they got more food than the others, the same affected their mating process also, the ones that got more food had better mating conditions than the ones who got less food. Similarly the birds who had beak shaped beaks conjured up the resources from the environment like nectar from flowers etc and they were also in a very good position. Natural selection refers to being in a very good position and being able to reproduce. This whole process is referred to as Natural selection." (Darwin and Natural Selection, 17 April 2009).
"Charles Darwin is believed to be the founder of this theory and he conducted a research in the 19th century on an island where he found that organisms that suit better to the environment are more likely to survive than the organisms that don't suit the environment." (Theory of Natural Selection, 17 April 2009).
The above diagram shows the evolution of beaks of these birds; their beaks are instrumental in determining how much food they get. Their beaks enable them to survive in different ecological conditions, the birds that eat grubs have a thin and an extended beak and the same enables them to poke into various holes and get the grubs. Finches that eat fruits and similar items would be less successful in doing so because their beaks don't allow them to do so. Peppered Moth is a classic example of Natural selection; Industrial melanism is a process that occurs in these species. This process has become very common since the beginning of the industrial age. The pollution let out by industries and vehicles would collect on the sides of several buildings and the same changes the color of the buildings making the buildings darker. The Peppered Moth is usually light in color and the predators that eat Peppered Moth can easily catch and feed upon the moth because of its evident visibility against the dark background caused by pollution. After a point in time the process of mutation took place in these species of Peppered Moths and these days, they have become darker in color when compared to the white Peppered Moths, this means they have again become very difficult to trace and hunt for predators that feed upon them. In this particular case, the process of Natural Selection