This clear and colorful pyramid diagram illustrates the five levels of organization in multicellular organisms: Cells → Tissues → Organs → Organ Systems → Organism. Each level is illustrated with relatable examples (muscle cell, nerve cell, muscle tissue, nervous tissue, heart, brain, circulatory system, nervous system, and a human). The "increasing complexity" arrow reinforces the hierarchical structure. Perfect for: • Middle school life science and biology units • Introducing cell theory and