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Read the description on bacteria and answer the questions given below.

Under favourable circumstances, bacteria divide every 20 minutes. The rapid multiplication results in the mutation in the DNA. Mutation causes the formation of new bacteria, producing different enzymes. 

a. What will be the crisis created in the medical field by such changes in pathogenic bacteria?

b. Which theory of evolution is justified by changes in bacteria?

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a. Bacteria which show immunity to medicines are formed. 

b. The theory of Natural Selection.

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