Evolution is the process in which species change over time to create new species. But how does it work? Jean-Baptiste Lamarck thought he knew. Lamarck’s theory of use/disuse and acquired traits states that species evolve because of traits acquired through over-use and under use of body parts. Lamarck’s theory, however, is not widely accepted as the truth on the origin of species. Almost 60 years later, Charles Darwin published his theory of Natural Selection (or ‘survival of the fittest’). Darwin’s theory is the most widely accepted on how species have evolved, because of the large amount of evidence that supports the theory, such as fossils, and obvious genetic differences between species to find a common ancestor.
Darwin found four required conditions that must be in place for natural selection to occur, variation within species (genetically or physically), selection pressure, differential reproduction and heredity. The four conditions show within what circumstances natural selection, and
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Pneumoniae. It is also expected that the percentage will continue to increase, although subject to fluxuations when the demand and usage of the antibiotic may increase or decrease, depending on the consumer demand. The percentage increase of each of the other antibiotics, however, was closer in number throughout the years than trimethoprim was to the rest, especially around 1988-1996. Because of this, it is difficult to predict what the percentage increase up to the present day will be. However, it can be predicted that erythromycin will continue to be the next highest antibiotic that S. Pneumoniae will be resistant to. The final two antibiotics examined, penicillin and tetracycline, may stay relatively close to each other in relation to the percentage of cases in which they are used and have found to be