Early Earth History

Sci 4.2

Question 1

Precambrian time• 1st 4 bil. years

• Few rocks older than 3.5 bil.

due to erosion and remelting

Question 2

1st organisms were single celled• cyanobacteria: (blue-green algae) did photosynthesis• Produced stromatolite fossils

Question 3

photosynthesis• In chlorophyll, CO2 is taken apart

A fewtypes ofCyano-bacteria

• CO2 light C + O2

• In stratosphere O2 UV light O3 (ozone layer)

Question 4

Invertebrates:• Animals without backbones• Appeared late Precambrian• Ediacaran fauna

Question 5

Paleozoic era• 1st animals with hard parts• 1st insects• 1st Vertebrates • Shallow seas

Dunkleosteus a.k.a. Bonefish

Question 6

Amphibians:• Lungs, must lay eggs in moist places

• May have evolved from fish like

Had both lungs and gills

Question 7

1st Insects• Appeared about same time as

amphibians

Reptiles:• Evolved from amphibians• Have scales to retain water• Eggs have protective membrane

Question 8

Appalachian/Atlas mtn.s

Pangea formsin late Paleozoic

Breaks apart inearly Mesozoic

Question 9

End of Paleozoic• 90% marine species became extinct

• 70% land “ “ “

• Pangea and glaciers formed

Question 10

Organize in order of appearance on earth

• Invertebrates

• Vertebrates (fish)

• Amphibians

(and insects)

• Reptiles

• Amphibians

(and insects)

• Vertebrates (fish)

• Reptiles

• Invertebrates