Again the soul moves into a foetus inside the womb of a mother. After time it emerges as a newborn baby and immediately begins to show the sanskars it had developed in its previous life. It is the same soul but in a new physical situation. Thus death is merely the means by which a complete change of circumstances and environment for the soul takes place. Time never kills the soul, but the body, being a part of nature or matter, obeys the law of decay that everything new becomes old and eventually finishes. The molecular components of this body disintegrate only to re-integrate as another form (body) some time later.
The process of birth-life-death-rebirth is also eternal (without a beginning or an end). It has always been going on and will continue. The soul comes into the body, expresses a role and experiences the results of that for a certain time, then leaves it, and the process starts again. Similarly, souls come into this world, remain here as actors for a number of births and then return to the region from which they come, for rest. This process also starts again. The pattern is a cyclic one. This is called the eternal world cycle.