how can there be reincarnation if population grows exponentially? only some people were people in the past?
And some people are 'new souls'. It's more of "being cut from the same cloth" type thing.
Imagine "Spirit" as a big blanket of light over the planet and some of that light inhabits different bodies, on different planes.(mental, etheral, physical, astral, casual) upon death one or more of those bodies or energy signatures, returns to its source to deposit information (Returns to Earth's magnetic or crystalline(silicone surface) field knowledge, or the Akashic Records, the ethreal, film reel of the Souls individual and collective journey.)