Those who accept the theory of heredity deny the existence of the human soul as an entity separable from the gross physical organism. Consequently they do not discuss the question whether the individual soul existed in the past or will continue to exist after the death of the body. This kind of question does not disturb their minds. They generally maintain that the individual soul is inseparable from the body or the brain or nervous system; consequently what we call soul or the conscious entity or the thinker is produced along with the birth of the organism or brain, lasts as long as the body lasts and dies when the organism is dissolved into its elements. But those, on the other hand, who accept the theory of Reincarnation admit the existence of soul as a conscious entity which is independent of the physical organism, that it continues to live after death and that it existed before the birth of the body. The theory of heredity has always been supported by the materialistic scientists, atheists and agnostics of all ages and also by those who believe in the special creation of the first man and woman at a certain definite time and that their qualities, character, life and soul have been transmitted to all humanity through successive generations. The commonly accepted meaning of the theory of heredity is that all the well-marked peculiarities, both physical and mental, in the parents are handed on to the children; or, in other words, heredity is that property of an organism by which its peculiar nature is transmitted to its descendants.