Three Domains of Life Biology Introduction to Biology Three Domains of Life Questions What are diatoms? Where are an insect's wings typically located? Another possible way to classify organisms would be to separate them into unicellular and multicellular organisms. Why is this not a useful classification system? What kind of energy is used to support life on earth? Introduction to Biology View all chapters Foundation of Biology Classification and Domains of Life Hierarchy of Life (Levels of Organization) The Characteristics of Living Things Three Domains of Life Miller–Urey Experiment Prev Next