Evolution exam 2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Precambrian- time range | 3800-570mya
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| Origin of life | Precambrian
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| Archaea and bacteria, O2 released in atmosphere | Precambrian
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| Four Eras | Precambrian, Paleozoic, Mesozoic, Cenozoic
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| Paleozoic- time range | 570-245 mya
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| Periods of Paleozoic | Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian
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| Cambrian- time | 570 mya
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| sea life, earliest vertebrates | Cambrian
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| Cambrian radiation | increase O2, Hox genes, most body plans evolved in this era
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| Cambrian extinction | global coolning and O2 depletion, glaciers form and sea levels fall, cool waters
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| Cambrian extinction- species | trilobite, echnoderms
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| Ordovician- time | 505 mya
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| 1st fish | Ordovician
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| Ordovician extinction | nearly as bad as Permian, landmass passed over north pole, massive ice sheets formed, sea level decreased
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| Silurian- time | 438 mya
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| 1st land plant | Silurian
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| Devonian-time | 408 mya
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| 1st amphibians | Devonian
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| lobe and ray finned fish | Devonian
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| Land really gets going | Devonian
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| Devonian extinction | glaciation, possible meter impacts
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| Devonian extinction- species | mostly marine life, reef builders lost, brachipods, jawless fish, trilobites
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| Carboniferous- time | 360 mya
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| 1st reptiles | Carboniferous
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| Permian- time | 286 mya
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| 1st modern insects | Permian
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| winged insects | Permian
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| tropical climates, swamp forests | Permian
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| Permian extinction | cause unclear, "big one," Pangea formed
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| Permian extinction- species | 96% of all skeleton bearing marine species, trilobites, pelycosaurs
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| Periods of Mesozoic | Triassic, Jurassic, Cretaceous
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| Mesozoic- time range | 245-66 mya
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| Triassic- time | 245 mya
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| 1st mammals | Trassic
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| 1 lower jaw, 3 ear bones, differentiated teeth | mammals
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| Pangea breaks up | Trassic
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| Warm climate | Trassic
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| Synapsid therapods were ancestrak | Trassic
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| Jurassic- time | 208 mya
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| dinosaurs dominant | Jurassic
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| birds | Juraasic
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| Synapomorphy is not feathers(birds) | opposable hind toe, hollow bones
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| Modern birds | keeled breast bone, no teeth, no claws
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| Cretaceous- time | 144 mya
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| dinosaurs extinction | Cretaceous
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| Angiosperms | Cretaceous
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| insects diversify and social insects evolve | Cretaceous
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| Cenozoic- time range | 66- present
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| Early Cenozoic- time | 66 mya
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| 1st large mammals and primitive primates | Early Cenozoic
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| formation of Himalayas | Early Cenozoic
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| grasses are popular | Early Cenozoic
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| origins of most modern mammals, rodents | Early Cenozoic
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| North America isolated from Europe, Gondwanaland breaks up, Panama, Australia separates | Early Cenozoic
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| Late Cenozoic- time | 23.7 mya
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| development of most modern mammals and birds | Late Cenozoic
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| ape like ancestor of humans appear | Late Cenozoic
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| Late Cenozoic- extinction | big land and water animals get large and then die out
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| Pleistocene- time | 1.6 mya
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| ice age begins | Pleistocene
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| Pleistocene ice age | glaciations cause decrease in sea level and extinction
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| earliest humans | Pleistocene
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| Present- time | .01 mya
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| ice age ends | Present
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