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Atom
1st level of organization
The basic unit of matter
Molecule
2nd level of organization
Groups of atoms that make up substances
Organelle
3rd level of organization
Specialized structures within cells that perform specific functions
Cell
4th level of organization
Smallest unit of life
Tissue
5th level of organization
Groups of similar cells that perform a particular function
Organ
6th level of organization
Group of tissues that work together to perform a specific function
Organ System
7th level of organization
Group of organs that work together to perform closely related functions
Organism
8th level of organization
Individual living thing
Population
9th level of organization
Organisms of one type in the same area
Community
10th level of organization
Different populations living in the same area
Ecosystem
11th level of organization
Different populations living in the same area including the non-living surroundings
Biosphere
12th level of organization
Earth
Sum of all ecosystems