According to (super)string theory, each fundamental particle represents a different vibrational mode of a relativistic string and each type of vibration pattern represents a different particle. But since the vibration only changes the energy of the string, how then are particles of different spin (bosons and fermions) distinguishable?
In other words, does the vibrating pattern of the string alter the spin of the particle?
ADDENDUM: Actually, unless i'm missing something, it seems the fundamentals of String Theory are inconsistent with the Standard Model of high energy physics.
Indeed, suppose that superstring theory is a valid theory of nature. That is, every fundamental particle of nature is a vibrating string, with each vibrational mode corresponding to a different particle. Consider a string from special relativity. That is, the string is moving at the speed of light but not accelerating, so that its angular momentum (hence spin) remains constant. Since the spectrum of this string would contain particles of the same spin, it follows in particular that the spectrum cannot contain both fermions and bosons, thus is inconsistent with Nature. In particular, since the present Standard Model of high energy physics incorporates special relativity, it follows in particular that the fundamentals of String Theory are not consistent with the Standard Model, as claimed.