A bacteria called E. coli is found in different kinds of foods, including beef. Thoroughly cooking beef can help prevent infections caused by E. coli.

E. coli can cause infections, so in this context it is harmful. Thoroughly cooking beef exposes the bacteria to high temperatures, which can kill it and reduce the risk of infection. Oxygen is not the method described for preventing these infections, so choice C, “E. coli is a harmful bacteria that can be killed by high temperatures,” is correct.

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