Levels of Organization

Front

Atom → molecule → organelle → cell → tissue → organ → system → organism → population → community → ecosystem → biosphere.

Back

Levels of Organization

Front

The smallest unit that makes up the known elements.

Back

Atom

Front

The smallest unit of a compound consisting of two or more atoms bonded together.

Back

Molecule

Front

Structures in a cell that have specialized jobs. Similar concept to organs for the human body.

Back

Organelles

Front

The basic building block of living things, made up of organelles.

Back

Cell

Front

Groups of cells with similar functions.

Back

Tissues

Front

Group of tissues with similar functions.

Back

Organs

Front

Group of organs with similar functions.

Back

System

Front

Any single living individual, and can refer to a single human, animal, plant, Protista, bacteria, or fungi.

Back

Organism

Front

Organisms who are members of the same species in an ecosystem.

Back

Population