Precambrian: Difference between revisions
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The '''Precambrian''' ([[PROSE]]: {{cs|Prehistory Repeating Itself (feature)}}, {{cs|The Myriapod Mutiny (short story)}}) also spelled '''pre-Cambrian''', ([[PROSE]]: {{Cs|Deceit (novel)}}, {{cs|Blood Heat (novel)}}) was a period of [[Earth]] [[history]] which spanned from [[4500000000 (number)|4.5 billion]] to [[542000000 (number)|542 million]] [[BCE]] | The '''Precambrian''' ([[PROSE]]: {{cs|Prehistory Repeating Itself (feature)}}, {{cs|The Myriapod Mutiny (short story)}}) also spelled '''pre-Cambrian''', ([[PROSE]]: {{Cs|Deceit (novel)}}, {{cs|Blood Heat (novel)}}) was a period of [[Earth]] [[history]] which spanned from [[4500000000 (number)|4.5 billion]] to [[542000000 (number)|542 million]] [[BCE]], when [[animal]]s first evolved and the [[Cambrian]] period began. The Precambrian accounted for [[87 (number)|87]][[%]] of Earth's history as of the [[21st century]]. | ||
[[Life]] [[evolved]] during the Precambrian, but consisted of only [[single-celled organism]]s and [[bacteria]] for [[billion]]s of [[year]]s. There were no [[plant]]s, no [[animal]]s, nothing but [[microscopic]] [[creature]]s. These tiny [[organism]]s were responsible for the biggest change in Earth's [[atmosphere]]; through [[photosynthesis]], they added [[oxygen]] to the planet's atmosphere, making it possible for larger, more complex life to evolve. The [[oxygen catastrophe]] wiped out much of the existing life on Earth that could not tolerate the new oxygen-rich conditions. From the perspective of 21st century [[human]]ity, a creature or [[disease]] from the Precambrian would be as incomprehensible and bizarre, and potentially as [[danger]]ous, as an [[alien]]. ([[PROSE]]: {{cs|Prehistory Repeating Itself (feature)}}) | |||
{{Geologic time scale}} | {{Geologic time scale}} | ||
[[Category:Human eras]] | [[Category:Human eras]] | ||
Revision as of 03:41, 5 November 2024
The Precambrian (PROSE: Prehistory Repeating Itself [+]Loading...["Prehistory Repeating Itself (feature)"], The Myriapod Mutiny [+]Loading...["The Myriapod Mutiny (short story)"]) also spelled pre-Cambrian, (PROSE: Deceit [+]Loading...["Deceit (novel)"], Blood Heat [+]Loading...["Blood Heat (novel)"]) was a period of Earth history which spanned from 4.5 billion to 542 million BCE, when animals first evolved and the Cambrian period began. The Precambrian accounted for 87% of Earth's history as of the 21st century.
Life evolved during the Precambrian, but consisted of only single-celled organisms and bacteria for billions of years. There were no plants, no animals, nothing but microscopic creatures. These tiny organisms were responsible for the biggest change in Earth's atmosphere; through photosynthesis, they added oxygen to the planet's atmosphere, making it possible for larger, more complex life to evolve. The oxygen catastrophe wiped out much of the existing life on Earth that could not tolerate the new oxygen-rich conditions. From the perspective of 21st century humanity, a creature or disease from the Precambrian would be as incomprehensible and bizarre, and potentially as dangerous, as an alien. (PROSE: Prehistory Repeating Itself [+]Loading...["Prehistory Repeating Itself (feature)"])
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