Is man mortal given he assumes new forms of life even if he is reduced to dust

Is man mortal given he assumes new forms of life even if he is reduced to dust

Is man mortal given he assumes new forms of life even if he is reduced to dust (from dust sprouts new vegetative forms of life which in turn sustains animal life)? But what about the people who are cremated; they cannot make the mother earth richer. The only remains left of them may be their spirit (if there is one). Do they still live through their spirit or other etheric or esoteric bodies? In short the question is whether man is reduced to naught after death?

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