Why Do Scientists Think Extra Dimensions are Strings?

Poy
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I don't know to much about the string theory or loop theory really. I have read a few books on it, but I want to know: Why do scientists think any extra dimensions take the form of strings? Is it that the formula say that is what the strings are, or is it just a way to explain why we can't see the extra dimensions.
Thanks for any responses...
 
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Sorry, posted in the wrong area, but if some one could still tell me that would be great..
 
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