Scientists today know a lot more about evolution than Darwin did. By studying DNA they have learned some of the ways that chages in species come about. Mutations can cause a species to change. Change due to a mutation is different from change due to natural selection. A mutation occurs when a whole new gene is formed. A mutation is a kind of genetic mistake. Many mutations are harmful but sometimes a mutation introduces a helpful trait to a species. DNA is a nucleic acid that carries the genetic information into the cell. Evolution is a process in a species in which they change over thousands or millions years
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