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'''Amoebas''' are varied tiny unicellular [[aquatic]] or [[parasite|parasitic]] [[organism]]s. They are classified as [[protozoa]]ns of the [[genus]] '''Amoeba''' or related genera. They have no solid form, instead consisting of a mass of [[protoplasm]] containing one or more [[nuclei]] surrounded by a flexible outer [[membrane]]. It moves by means of [[pseudopod]]s. Some amoeba are parasites that cause amoebic dysentery. According to the Colonial Theory<ref>

'''Amoebas''' are varied tiny unicellular [[organism]]s. They were classified as [[protozoa]]ns of the [[genus]] '''Amoeba''' or related genera, but are now known to be part of the Unikonts. They have no solid form, instead consisting of a mass of [[protoplasm]] containing one or more [[nuclei]] surrounded by a flexible outer [[membrane]]. Most amoebae live in soil and are [[anaerobic]]. They move by means of [[pseudopod]]s formed by fibronectin. Some amoeba are parasites that cause amoebic dysentery and some forms of septicaemia.  

 

According to the Colonial Theory<ref>

John O. Corliss: Systematic Zoology, Vol. 8, No. 4 (Dec., 1959), pp. 169-190</ref>, in [[evolution]] history, amoeba-like organisms are believed to have contributed to the origin of multicellular organisms by clumping together to form colonies during food shortage, and eventually differentiating into various types of cells to give rise to the first multicellular organisms.

John O. Corliss: Systematic Zoology, Vol. 8, No. 4 (Dec., 1959), pp. 169-190</ref>, in [[evolution]] history, amoeba-like organisms are believed to have contributed to the origin of multicellular organisms by clumping together to form colonies during food shortage, and eventually differentiating into various types of cells to give rise to the first multicellular organisms.