Researchers have found that humans and rats are now susceptible to comparable health threats relating to contamination and sugary foods. Rats and humans have changed in their genetic make-up in response to city life. Rats genes have had key changes in DNA over hundreds of years as the species moved across Asia and eventually to Canada. The change in genes are a result of the need for the rats to adapt in order to live together with humans. One of the genes changes is a result of the rats need to move through sewers and pipes more easily. As a result of hundreds of years of changes in the rats diet has also changed their DNA.
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