Final answer:
Living organisms share key characteristics including response to the environment, growth and development, reproduction, homeostasis, and cell composition.
Step-by-step explanation:
All living organisms, including multicellular organisms, bacteria, fungi, and viruses, share several key characteristics or functions. They respond to their environment, grow and develop, reproduce, maintain a stable internal environment through homeostasis, and have complex chemistry. Additionally, all living things are composed of cells, with a cell being the basic unit of structure and function.