essentially people are just a cardio-vascular system, organs, and neurons
we think we're all unique because of memory system short/working/long term and also the genes that we carry
my point is that i think everyone always lives in the sense that the editorial 'you' not the actual 'you' will live again through another body not necessarily human and not necessarily this planet but you will live again
i dont believe in a soul or any of that stuff, thats not what im talking about. im talking about so long as there is life someone has to inhabit it in the sense of working memory, neural activity, etc i dont mean that you have some thing that jumps from body to body 'inhabiting'.
you won't have any recollections of past lives, there are no 'past lives' there is no karma food chain so to speak. i guess the best way to sum it up is that there will always be cognition. through new life comes new cognition and through new cognition comes actualization.