I have been told by my early school teachers about the soul. As I understood it, every human being has a soul. The soul was described to me as not a material entity, but it inhabits the human body in some way. When the person dies, the soul leaves the body and resides somewhere until the Last Judgement. I was told that non-human animals did not possess an immortal soul. The animal soul supposedly died when the animal died. This I think is the Christian belief. The soul is not matter nor energy but something else entirely. I think some non-Christian religions believe that all animals including human animals possess a soul. Some think the soul migrates at death to inhabit a new body, not necessarily of the human species, reincarnation. Correct me if I am wrong so far. If only humans have an immortal soul and non-human animals do not have an immortal soul, where along the long course of biological evolution from unicellular protista to Pikaia to fish to amphibians, to reptiles, to mammals, to mammal primates, to Apes/Monkeys, to Apes, to Hominids, to the first humans (H. habilis), to H. erectus, to H. rhodesiensis, to Homo sapiens sapiens. At what point in that direct evolutionary line, did immortal souls inhabit animals? Do all animals have the same kind of soul, or is it only humans? If only hominids, was it Ardipithecus or Australopithecus? If only members of the human genus, then which human first had an immortal soul? Was it H. rudolfensis, H. habilis, H. ergaster, H. erectus, H. rhodesiensis, or H. sapiens sapiens? Since that evolutionary transition was slow and gradual, it is difficult to draw a line where a Homo sapiens baby was born to H. rhodesiensis. If sapiens has an immortal soul and rhodesiensis does not, how did sapiens acquire the immortal soul? It seems reasonable that if we have an immortal soul it was present also in H. erectus, Australopithecus, Pierolanthropus, Carpolestes, Permian mammal-reptiles, amphibians, fish, amphioxus, Pikaia or some Cambrian worm. Second question is about the nature of the soul. If the soul is not matter or subatomic particles, or tiny vibrating energy strings, what is the composition of the soul? I realise that different religious systems may have different versions of what is the soul. My personal concept of soul is that it is the summation of active electrochemical circuits in networks that produce consciousness, cognition, memory, perception, reason, emotion, basic and complex motor functions, sexual identity, sexual orientation, and programmed sexual functions. When the person dies, where does this programme go? I believe that the soul vanishes in much the same way music stops when I unplug the radio.