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Endorphins are called pain controlling chemicals in the body.

The main objective of Service Level Management is to ensure that an agreed level of IT service is provided for all current IT services.

The Story telling or The narrative form of paintings were the early examples of art photography which were often imitated.

Abolition and hallucinations is the pair that consists of negative symptoms of schizophrenia.

From the given data,

3500x7xt/100 = 500

=> t = 100/49 years

Now, in the second case

The interest per year = 49/100 x 800 = 392

 => 4900 x 1 x r/100 = 392

=> r = 8%

In music, a fugue is a contrapuntal compositional technique in two or more voices, built on a subject that is introduced at the beginning in imitation and which recurs frequently in the course of the composition. 

Hence, the main theme of a fugue is called the subject.