<Body-mind>
1st way (Gene): Our ancestor's genes have been carried over by us and our genes will be carried over by our descendants.
2nd way (Energy): Our bodies and brains have been and will be conserved over time and space by changing form in ecosystem according to the law of conservation of energy and mass.
<Subconscious>
3rd way (Insight): Our ancestor's insights have been carried over by us and our insights will be carried over by our descendants, friends and disciples, through books and oral tradition.
4th way (Karma): Our actions (karma) have been and will be imprinted on subconscious over time and space by reincarnation according to the law of causality.