Many people believe that the idea of evolution is simply a theory. They are arguing that there is no scientific backing to this idea. However, anyone who believes that hasn’t took the time to analyze the abundance of evidence supporting this theory. This is the only reason why this misconception exists. Charles Darwin formulated this hypothesis in his book On the Origin of Species in 1859 (Than, 2015). He argued that “All life on earth is connected and related to each other,” and that the population size was regulated when “…some traits were favored in and environment over others” (Than, 2015). This is the basis of the theory of evolution. Today, from the evidence compiled from different sources, it is one of the strongest theories in science. Sources include areas such as anatomy, molecular biology, biogeography, fossils, and direct observation (Khan Academy, 2017). The first piece of evidence mentioned was anatomy. In the bone patterns of whales, humans, birds, and dogs are all very similar even though they are in different species. Since this is unlikely that these patterns would have developed independently, it shows that there was a basic layout of bones that existed prior in 1 common ancestor (Khan Academy, 2017). The next piece of evidence is undeniable: the make-up of an organism. All living things share the make up of DNA, the processes of transcription and translation, and building blocks such as amino acids (Khan Academy, 2017). All organisms must make proteins to carry out functions in their body; hence they must have DNA. By having these similarities, it is clear that similarities between organisms exist beyond the surface. Another clear piece of evidence is biogeography. It is clear that pangea existed (the supercontinent that began to break apart 200 million years ago). This was when groups of organisms were distributed world wide into small regions of earth. There are also organisms that can be traced back to the split between Laurasia (north) and Gondwana (south) (Khan Academy, 2017). Furthermore, a piece of evidence that is literally set in stone is the fossil record. In the fossils, one of the best studied organisms are horses. By using fossils, scientists have been able to discover the lineage from extinct horses to modern day horses. Details include the reduction of toed feet to hooves. This change could reflected an adaptation of the horse due to environmental stimuli (Khan Academy, 2017). The last piece of evidence is direct observation. An example was when DDT (a pesticide) was sprayed world-wide to kill mosquitos. At first it was working well; overtime mosquitos evolved resistance to the pesticide (Khan Academy, 2017). When those mosquitos reproduce, the next generation had DDT-resistance mosquitoes as well- making DDT an ineffective method to rid them now. This proves how an organism evolves to changes in its environment, proving population regulation through their surroundings. Overall, it is clear that the theory of evolution is supported very well from substantial evidence in structures of different organisms, similarities in biological molecules, geographical patterns relating to biology, the fossil record, and direct observation of adaptation.