A living body with kinetic energy is also a collection of objects, while an individual organism refers to an organism, as opposed to an abiotic one. Its elements include: living beings with viability and reproductive ability produced by chemical reactions under natural conditions, and living offspring that can respond to external stimuli and rely on and promote each other with the external environment through reproduction. Moreover, organisms can breathe and excrete useless substances in the body, which has the characteristics of heredity and variation.