The Signs of Life are evidence of the intelligence of life.
They are motions of the adaptive kind which show the presence and government of localized intelligence. They differ from the motions of universal forces, in that they show selection and the judgement of local intelligence in every phase. They meet, use, or oppose every enviromental circumstance, if it is within the range of their limitations. There are five principle signs of life. Their names in order of importance are: assimilation, excretion, adaptability, growth, and reproduction. An organism may have these signs so latent that it is difficult to tell whether the organism is alive or not. Yet this low organism has its share, its quota, the requisite amount of intelligence for its state of organization.