Early Earth History Sci 4.2

Question 1

Precambrian time 1 st 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, CO 2 is taken apart A few types of Cyano- bacteria CO 2 light C + O 2 In stratosphere O 2 UV light O 3 (ozone layer)

Question 4

Invertebrates: Animals without backbones Appeared late Precambrian Ediacaran fauna

Question 5

Paleozoic era 1 st animals with hard parts 1 st insects 1 st 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

1 st 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 forms in late Paleozoic Breaks apart in early 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