BYA Billion Years Ago Facebook comments preferred; negative anonymous comments will not display. Please read this page / post fully before commenting, thanks!Powered by Facebook CommentsRelated Articles: Glossary: ArcheanGlossary: ProterozoicIntroduction ContentsFRONT MATTERCHAPTER 1010.IV: Sun, Earth, and Moon10.V: Life10.VI: Summary9.III: Sexual Reproduction9.VII: The Rest Of The World