Just in tune with the law of conservation of energy and matter, it is noteworthy that as and when a being on this earth dies i.e. when the invisible enrgy which is called as spirit by us leaves the body, the body decomposes and forms part of the earth. It becomes the earth, the soil which is the site of vegetation that grows for the living beings existing on the surface of earth. In the ultimate analysis,the life on earth, whether vegetarian or non-vegetarian, lives on the green growth on earth i.e. plants and trees. And this vegetation(plants and trees) which sustains life itself derives its growth and nutrition from the earth, the soil.
We human beings or the other animals which live on earth derive their growth from this vegetation which in turn is formed from the nutrients which come from earth. In addition to this, whenever new life takes form inside of a mother, it also gets its physical envelope from the nutrients derived from that vegetation only. This means every new life on earth is composed of the ingredients derived from the earth which is formed of the decomposed remains of the dead beings. This means that the matter on earth recycles itself, it takes different forms everytime a new life comes into existence.
It means that this body of mine is composed of those materials/atoms which have been at some time in the past part of some other being. The energy(we call it spirit) which drives this physical existence of mine is i think different but the material composition is a repeatition, it is reconstitution. Since I took form inside of my mother, this physical existence bestowed on me has grown. In this gradual growth pattern of my body, even the primary stage i.e. the formation of embryo was a recontitution of the same old material.
This means that the earth and its constituents have remained the same since centuries(or probably since its inception). The only thing that has changed is the residence of energy(spirit which remains in transit: cycle of life and death) within that vast expanse of matter. When that energy (decides to or is asked to) take(s) shape, we say that a being has taken birth.
Life: Simple as it appears but mysterious in that which is yet to be understood.
