The answer is alliteration. 
14th century poets used the repetition of the first letter in a series of consecutive words or related phrases to make their writing easier to remember.  By repeating a sound, it is expected that the brain will catch onto the verses more easily, thus making it easier to remember.
 
        
                    
             
        
        
        
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Answer: By leading the Utilitarian movement.
Explanation: John Stuart Mill is an English phylosopher,known as one the greatest English phylosophers in history,he was born the year 1806. He was the one who led the Utilitarian movement which is known to be a movement concerned about the happiness of the people.
The Utilitarian Theory tries to show that all happiness is very vital for the wellbeing of man,and that all Government actions should be geared towards completly removing pains from the lives of people.
 
        
             
        
        
        
Hello. You did not enter the text to which this question refers, which makes it impossible for it to be answered. However, I will try to help you in the best possible way.
The main idea of a text is the main subject that the text addresses, the subject on which all the arguments presented are based. You will be able to understand this idea by reading the full text and identifying what the text is about. In this case, the key sentence of the text is the sentence that presents this subject in the most direct way possible. Generally, the main idea and the key sentence of the text are presented in the first paragraphs.
To develop the main idea, the text presents details, which are sentences that support this idea, showing how it is relevant and why it is true. These details are present throughout the text.
Pollution interferes with the functioning of body systems, allowing malefic substances to come into contact with the body and be absorbed, acting in the body in a harmful way, fighting health.