Biology: Kingdoms of Living Organisms and Their Characteristics

Archaebacteria (Archaea)

Mostly single-celled prokaryotic organisms found in extreme environments.

Eubacteria (Bacteria)

Mostly single-celled prokaryotic organisms found in common environments such as soil, water, and inside living organisms.

Protista

Mostly single-celled eukaryotic organisms including amoebas, paramecia, and some algae.

Fungi

Eukaryotic organisms that absorb nutrients from their surroundings, including mushrooms, molds, and yeasts.

Plantae

Multicellular eukaryotic organisms that make their own food through photosynthesis and generally have cell walls made of cellulose.

Animalia

Multicellular eukaryotic organisms that must consume other organisms for energy, generally lacking cell walls and capable of movement.