Abstract

Some things are living and some are not. Under the heading “living things” come entities at various levels of biological organization. Some are called “organisms.” However, the term “organism” does not pick out organismal entities uniformly—that is, among all the things that are considered to be whole living systems, some are regarded as indisputably organisms, and others are accorded only qualified organismic status. Perhaps this is because it is not clear why some biological systems should count as organisms and others should not.