Level one- Cells are the smallest part of living things Level two- Tissues are made by a group of cells Level three- Organs are made by groups of tissues Level Four- Organ Systems are made by organs...
1. cells2. tissues3. organs4. organ systems
Cells --> Tissues --> Organs --> Organ systems --> Organisms
The four levels of organization in a multi-cellular organism are cells, tissue, organs, and organ systems.
cell is the smallest level of organization in a unicellular organism
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