Hierarchical organization refers to the arrangement of elements or components within a system in a nested or layered manner, where higher-level entities or structures are composed of lower-level entities.
1. An Living organism consists of cells – these cells interact to form such an organism
2. Fish form a school of fish
3.Fish interact with vegetation to find places to reproduce (lay eggs) are eaten by larger fish and humans, they change the geomorphology by disturbing the bottom of the lake → they are part of an ecosystem