Biology Hierarchy of Biological Organization (from Smallest to Largest)
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Tissue
A group of similar cells
Molecule
A chemical structure consisting of atoms
Organism
An individual living thing
Cell
Life's fundamental unit of structure and function
Organelle
Little "organs" in the cell
Organ and Organ systems
Specialized body parts made up of tissues
Community
all different species in an ecosystem
Biosphere
all ecosystems on Earth
Ecosystem
all living and nonliving things in a particular area
Population
all same species in a particular area
Atom
basic unit of matter