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Plants
Plants are multicellular, autotrophic organisms. They make their own food through the process of photosynthesis, which uses light, oxygen and water. Plants are made up of eukaryotic cells, which are different from other organismic cells in that they contain chloroplasts and a rigid cell wall. Members of the plant kingdom include flowers, ferns, trees, grass and moss.
Animals
Animals are complex multicellular, heterotrophic organisms. They generally feed on plants and other animals. The animal kingdom is the largest, consisting of more than 1 million different species. Animal cells are enclosed by a plasma membrane. Members of the animal kingdom include humans, canines, felines, birds and fish.
Archaebacteria
Archaebacteria are single-celled organisms that live in extreme environments. They have been found in underground thermal vents and hot springs with boiling temperatures, limited oxygen and high acidity. Most archaebacteria are chemotrophic, relying on the chemicals around them to produce their own food.
Eubacteria
Eubacteria are single-celled, eukaryotic organisms that live in diverse environments. Eubacteria can be photoautotrophs, saprophytes or symbionts. Although eubacteria are usually the cause of the most common illnesses, the majority of eubacteria are harmless in the natural world. Eubacteria cells are covered by a capsule and DNA information contained in special structures called ribosomes.
Fungi
Fungi are multicellular, eukaryotic organisms that feed by breaking down dead organic matter. Fungi are unable to move and have no sensory abilities, which make them dissimilar to plants and animals. However, fungi are unable to perform photosynthesis and their cells are more similar to those found in the animal kingdom. Mushrooms are members of the fungi kingdom.
Protists
Protists are organisms that do not fit clearly into any other kingdom. Most protists are unicellular, which prevents them from being classified as a plant, animal or fungus. However, they typically have complex cells that are quite different from eubacteria and archaebacteria. Examples of protists include algae and protozoans.