Over time organisms change due to natural selection and genetic drift producing an adaptation within the preexisting species or a new species all together. The logic behind this theory is that those with genes helpful for survival are more likely to produce offspring and pass those traits on, slowly resulting in a population with more of the helpful genes; however, genetic drift can cause random impact on the frequency of alleles within a population. Mutation is another factor by which change in a species may occur. It takes place when the cell copies its DNA before dividing sometimes swapping a base for another or adding or deleting a base. Although these mistakes are generally harmless they are still heritable and are passed down on to next generati...
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... layers contain vastly different organisms than we have today, while each layer closer to the surface contains more identifiable fossils. Fossilized rock presents the complex changes that evolve over time. Evidence I found most compelling for evolution was that, “humans still have a remnant of a gene required for producing the yolk found in a bird and reptile egg…this gene remnant was directly predicted by scientists who knew where it would be based on where it is in the chicken genome” (Biologos). Evidence that appears to discredit evolution are unanswered questions about the human body for instance why we have an inactive gene to produce vitamin C when this presents no plausible benefit to the species. Evolution remains a theory and facts evidence shown to disprove it should always be examined, however currently there is great evidence in support of the theory.
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