Biological life refers to living organisms that exhibit characteristics such as growth, reproduction, and response to stimuli. These organisms are made up of cells, which are the basic units of life. Examples of biological life include plants, animals, fungi, and microorganisms. Biological life relies on energy, often obtained from the environment, to sustain its functions. This energy is typically derived from sources like sunlight for photosynthetic organisms or food for animals. The study of biological life encompasses various fields, including biology, ecology, and zoology.