Answers

2016-04-22T20:10:59+05:30
Because it is an inexact science.
Two of the functions of science agree  but  one does not agree.
1) Based personal experience 
2) Systemized body of knowledge.
3) Universal Applicability - is not agreed.
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2016-04-22T20:24:24+05:30
its because its a science with systematic body of knowledge and universal application
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