Do all objects contain further subdivisions or does the chain of subdivision end at some ultimately elementary particle.

If this is true then how can any part of the universe be non homogenous to another. What would make one part different to another if the particles that construct it are all the same ?

And if matter is infinitely subdivided at some point would we not reach and infinitely simple particle and again find the same paradox as above ?

This baffles me profusely. ouch