Proterozoic era

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Proterozoic era: see Precambrian era Precambrian era, name of a major division of geologic time (see Geologic Timescale, table), from c.5 billion to 570 million years ago. It is often divided into the Archeozoic and Proterozoic; in other countries, the Precambrian is broken into other divisions,
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No references found			It has always been thought that the Earth completely froze twice during the late Proterozoic era between 600 and 800million years ago. WELL 'ARD MALLARD; Monster duck was 15ft tall and half a tonne It had ... by Daily Record (Glasgow, Scotland) 2 billion years ago, during Earth's Proterozoic era. When glaciers covered the entire Earth by Monastersky, Richard / Science News If the hours seem to streak by and each day ends too quickly, stop a moment and consider the tempo of time during the Proterozoic era, 900 million years ago. The moon's tug stretches out the day by Monastersky, R. / Science News			Proteinaceous Artificial Fibers proteinase Proteinoid proteinometer Proteins Proteins, evolution of proteinuria Proteocephalidae Proteocephaloidea proteoglycan proteolysin Proteolysis Proteolytic Enzyme proteome proteomics Proteomyxida Proteomyxidia proteoplast proteose Proterogenesis Proterostomia Proterosuchia Proterotheriidae Proterozoic Proterozoic Eon Proterozoic era Proterozoic Erathem Protesilaus Protest Protestant Protestant Chorale Protestant Episcopal Church Protestant ethic Protestant Union Protestant Union of 1608 Protestantism Proteus Proteus Vulgaris Proteutheria Prothalamion Prothallium Prothero, Rowland Edmund prothesis prothoracic gland prothorax Prothrombin prothrombin factor prothrombin time prothymocyte prothyron Protic, Stojan			proteosome vaccine Proterandrous Proterandry Proteranthous protero- Proterochampsa Proterogenesis Proteroglyph Proteroglyph Proteroglypha Proteroglypha Proteroglyphous Proteroglyphous Proteroglyphs Proteroglyphs Proterogynous Proteromonas Proterosaurus Proterostomia Proterosuchia Proterotheriidae Proterozoic Proterozoic Proterozoic Proterozoic aeon Proterozoic Age Proterozoic Age Proterozoic eon Proterozoic eon Proterozoic eon Proterozoic era Proterozoic Erathem Proterozoicum Proterozoicum protervitas Protervity Protesilaos Protesilaos Protesilaus Protesilaus protest protest protest protest protest protest about protest against protest against protest against a ruling protest frivolously protest march protest meeting Protest Outrageous Oil Prices Protest the Hero protest too much Protest vote Protest votes Protest Warrior Protest Warrior Protestancy Protestando

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