-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?
Biology Today and Tomorrow without Physiology (MindTap Course List)
5th Edition
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Christine Evers, Lisa Starr
Chapter11: Evidence Of Evolution
Section: Chapter Questions
Problem 2FIO
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Question
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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?
![Event #
Date in years before
Event
present
1
4.6 billion
Earth forms
2
3.8 billion
First evidence of life
First fossils (algae and bacteria)
Free oxygen increasing rapidly in atmosphere
Eukaryotic organisms evolve
First fossil of a complex organism (a worm)
Cambrian Explosion- First abundant life found in the rock record
First land plants
3
3.5 billion
4
2.7-2.4 billion
5
1.8 billion
1.2 billion
7
535 million
8.
9.
470 million
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
Breakup of super-continent Pangaea begins
First flowering plants
Dinosaurs and other animals go extinct
Mammals/flowering plants become abundant
First primate in genus Homo
First Homo sapiens
14
200-220 million
140 million
65 million
15
16
17
30 million
18
2.4 million
19
195,000
13,000
10,000
2,000
~500
20
Humans first inhabit North America
21
End of last Ice Age
22
Roman domination of the Old World
23
European rediscovery of the Americas
~37
Humans first explore the moon
24](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff3b1f4d5-e8c4-49af-80cf-c1843c8461c2%2Fdbb9d7ce-f3ca-4cbd-85a9-6128b7de1b08%2Fb6k2cdq_processed.png&w=3840&q=75)
Transcribed Image Text:Event #
Date in years before
Event
present
1
4.6 billion
Earth forms
2
3.8 billion
First evidence of life
First fossils (algae and bacteria)
Free oxygen increasing rapidly in atmosphere
Eukaryotic organisms evolve
First fossil of a complex organism (a worm)
Cambrian Explosion- First abundant life found in the rock record
First land plants
3
3.5 billion
4
2.7-2.4 billion
5
1.8 billion
1.2 billion
7
535 million
8.
9.
470 million
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
Breakup of super-continent Pangaea begins
First flowering plants
Dinosaurs and other animals go extinct
Mammals/flowering plants become abundant
First primate in genus Homo
First Homo sapiens
14
200-220 million
140 million
65 million
15
16
17
30 million
18
2.4 million
19
195,000
13,000
10,000
2,000
~500
20
Humans first inhabit North America
21
End of last Ice Age
22
Roman domination of the Old World
23
European rediscovery of the Americas
~37
Humans first explore the moon
24
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