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-How long is the time span between the appearance of free atmospheric oxygen and evidence of complex (multicellular) forms? -How much time is there between complex forms and the Cambrian Explosion?

-How long is the time span between the appearance of free atmospheric oxygen and evidence of complex (multicellular) forms? -How much time is there between complex forms and the Cambrian Explosion?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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-How long is the time span between the appearance of free atmospheric oxygen and evidence of complex (multicellular) forms?

-How much time is there between complex forms and the Cambrian Explosion?

**Geological and Biological Milestones in Earth's History** This table summarizes key events in Earth's geological and biological history, detailing significant developments from the formation of the Earth to modern-day human achievements. | **Event #** | **Date in years before present** | **Event** | |-------------|----------------------------|--------| | 1 | 4.6 billion | Earth forms | | 2 | 3.8 billion | First evidence of life | | 3 | 3.5 billion | First fossils (algae and bacteria) | | 4 | 2.7-2.4 billion | Free oxygen increasing rapidly in atmosphere | | 5 | 1.8 billion | Eukaryotic organisms evolve | | 6 | 1.2 billion | First fossil of a complex organism (a worm) | | 7 | 535 million | Cambrian Explosion - First abundant life found in the rock record | | 8 | 470 million | First land plants | | 9 | 460 million | First fish | | 10 | 410 million | First land animals | | 11 | 251 million | Largest mass extinction occurs | | 12 | 247 million | First dinosaurs | | 13 | 200 million | First mammals | | 14 | 200-220 million | Breakup of super-continent Pangaea begins | | 15 | 140 million | First flowering plants | | 16 | 65 million | Dinosaurs and other animals go extinct | | 17 | 30 million | Mammals/flowering plants become abundant | | 18 | 2.4 million | First primate in the genus *Homo* | | 19 | 195,000 | First *Homo sapiens* | | 20 | 13,000 | Humans first inhabit North America | | 21 | 10,000 | End of the last Ice Age | | 22 | 2,000 | Roman domination of the Old World | | 23 | ~500 | European rediscovery of the Americas | | 24 | ~37 | Humans first explore the moon | ### Explanation of Key Events 1. **Earth Formation (4
Transcribed Image Text:**Geological and Biological Milestones in Earth's History** This table summarizes key events in Earth's geological and biological history, detailing significant developments from the formation of the Earth to modern-day human achievements. | **Event #** | **Date in years before present** | **Event** | |-------------|----------------------------|--------| | 1 | 4.6 billion | Earth forms | | 2 | 3.8 billion | First evidence of life | | 3 | 3.5 billion | First fossils (algae and bacteria) | | 4 | 2.7-2.4 billion | Free oxygen increasing rapidly in atmosphere | | 5 | 1.8 billion | Eukaryotic organisms evolve | | 6 | 1.2 billion | First fossil of a complex organism (a worm) | | 7 | 535 million | Cambrian Explosion - First abundant life found in the rock record | | 8 | 470 million | First land plants | | 9 | 460 million | First fish | | 10 | 410 million | First land animals | | 11 | 251 million | Largest mass extinction occurs | | 12 | 247 million | First dinosaurs | | 13 | 200 million | First mammals | | 14 | 200-220 million | Breakup of super-continent Pangaea begins | | 15 | 140 million | First flowering plants | | 16 | 65 million | Dinosaurs and other animals go extinct | | 17 | 30 million | Mammals/flowering plants become abundant | | 18 | 2.4 million | First primate in the genus *Homo* | | 19 | 195,000 | First *Homo sapiens* | | 20 | 13,000 | Humans first inhabit North America | | 21 | 10,000 | End of the last Ice Age | | 22 | 2,000 | Roman domination of the Old World | | 23 | ~500 | European rediscovery of the Americas | | 24 | ~37 | Humans first explore the moon | ### Explanation of Key Events 1. **Earth Formation (4
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