"Unlike a Feynman graph, which is divided into different lines, which can represent particles of different types with different masses and spins, any part of a string world sheet is equivalent to any other so "there is only one string." Whatever particles there are going to be represent different states of vibration of one basic string. Also there are not any vertices in the string world sheet so we do not have the freedom to tell the string how to interact."
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Edward Witten in (25:46 of 1:22:54 in video)
https://en.wikiquote.org/wiki/String_theory
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String theory
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