c. Resistant bacteria have survived and reproduced at a greater rate than nonresistant bacteria
Explanation:
The antibiotic is no longer effective as it was 20 years ago because the resistant bacterial have survived and reproduced at a greater rate than the non-resistant bacteria. 
- The antibiotics have specifically designed to exterminate the disease causing bacteria strain from the body. 
- While at that point in time, it is potent and does the work. Along the line, it will cause the structures of some other strains to change. 
- This will lead to the development of resistant breeds with time. 
- The resistant breed will then be able to survive the onslaught of the antibiotics making it not a good fit. 
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Answer: Any of a number of organized or specialized structures within a living cell.
Explanation: Hope this helps
 
        
                    
             
        
        
        
Answer:
The water is hypotonic to the body of the patients
Explanation:
<em>Pure water is generally hypotonic to the red blood cells in the body of humans. Hence, if a person is hooked up to an IV line that included pure water, the red blood cells in the person's body will take-in water, become turgid, and then start lysing. This will make the person become sick or even cause death in severe cases.</em>