early earth history sci 4.2. question 1 precambrian time 1 st 4 bil. years few rocks older than 3.5...
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Early Earth History
Sci 4.2
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Question 1
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Precambrian time• 1st 4 bil. years
• Few rocks older than 3.5 bil.
due to erosion and remelting
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Question 2
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1st organisms were single celled• cyanobacteria: (blue-green algae) did photosynthesis• Produced stromatolite fossils
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Question 3
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photosynthesis• In chlorophyll, CO2 is taken apart
A fewtypes ofCyano-bacteria
• CO2 light C + O2
• In stratosphere O2 UV light O3 (ozone layer)
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Question 4
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Invertebrates:• Animals without backbones• Appeared late Precambrian• Ediacaran fauna
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Question 5
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Paleozoic era• 1st animals with hard parts• 1st insects• 1st Vertebrates • Shallow seas
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Dunkleosteus a.k.a. Bonefish
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Question 6
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Amphibians:• Lungs, must lay eggs in moist places
• May have evolved from fish like
Had both lungs and gills
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Question 7
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1st Insects• Appeared about same time as
amphibians
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Reptiles:• Evolved from amphibians• Have scales to retain water• Eggs have protective membrane
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Question 8
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Appalachian/Atlas mtn.s
Pangea formsin late Paleozoic
Breaks apart inearly Mesozoic
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Question 9
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End of Paleozoic• 90% marine species became extinct
• 70% land “ “ “
• Pangea and glaciers formed
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Question 10
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Organize in order of appearance on earth
• Invertebrates
• Vertebrates (fish)
• Amphibians
(and insects)
• Reptiles
• Amphibians
(and insects)
• Vertebrates (fish)
• Reptiles
• Invertebrates
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