Biology Hierarchy of Biological Organization (from Smallest to Largest)

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