The document outlines the scientific rules for determining if something is considered living: 1) All living things are made of one or more cells, respond to stimuli, develop and grow, obtain energy through eating or photosynthesis, reproduce, and adapt to their environment. 2) To be considered living, an organism must be able to perform all of these functions by itself. If it cannot, it is considered non-living or never alive. 3) All living things require shelter, food, water, and air to survive.