1.   Bacteria can develop resistance to drugs they are frequently exposed to, by random mutations some of which allow the microbes to survive.

2.   Because chickens have been fed fluoroquinolones, the campylobacter bacterium has developed a resistance to that class of antibiotics.

3.   Kennedy said he thought the risk that resistant bacteria might develop from such long-term exposure to the antibiotics was small.

4.   So bacteria have developed special mechanisms for getting and assimilating whatever iron they can.

5.   The treatment of sinus infections has become an increasing challenge as more and more bacteria develop resistance to commonly used antibiotics.

6.   If a patient fails to complete the treatment course, the bacteria can develop resistance to the drug and people infected later will have a harder time overcoming it.

7.   Scientists theorize that the existence of large amounts of surface water would enhance the prospects that bacteria once developed on Mars.

8.   She said indiscriminate antibiotic use has caused the bacteria to rapidly develop resistance to the disease.

9.   She said indiscriminate antibiotic use has caused the bacteria to rapidly develop resistance to drugs.

10.   Then some bacteria developed the ability of green plants to photosynthesise or manufacture food with the help of sunlight.