Abstract
These days, the right of self-determination and self-ownership are loudly advocated, though the ideas of these words are traced back to the natural law theory in 17th and 18th centuries. Why have those ideas come to the fore again and been discussed so much? I think they were called back by the newly occurred problems such as brain death, the possibility of organ transplantation and artificial reproduction, etc. People who want to push ahead with these remarkable results in the medical world put use the word right as a whole. But what is right? What is ownership? Here I will elucidate them on the basis of a realistic point of view. In the last analysis a human being is not a particular existence equipped with universal human rights. A human being is a kind of creature living on the earth, having inherited its genes from unknown ancestors who occurred on the earth 4,400,000 years ago. The earth is a closed system, so, our various wants must be under control in order to keep harmony with the order of nature on the earth.
