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Evolution exam 2
| Term | Definition |
|---|---|
| Precambrian- time range | 3800-570mya |
| Origin of life | Precambrian |
| Archaea and bacteria, O2 released in atmosphere | Precambrian |
| Four Eras | Precambrian, Paleozoic, Mesozoic, Cenozoic |
| Paleozoic- time range | 570-245 mya |
| Periods of Paleozoic | Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian |
| Cambrian- time | 570 mya |
| sea life, earliest vertebrates | Cambrian |
| Cambrian radiation | increase O2, Hox genes, most body plans evolved in this era |
| Cambrian extinction | global coolning and O2 depletion, glaciers form and sea levels fall, cool waters |
| Cambrian extinction- species | trilobite, echnoderms |
| Ordovician- time | 505 mya |
| 1st fish | Ordovician |
| Ordovician extinction | nearly as bad as Permian, landmass passed over north pole, massive ice sheets formed, sea level decreased |
| Silurian- time | 438 mya |
| 1st land plant | Silurian |
| Devonian-time | 408 mya |
| 1st amphibians | Devonian |
| lobe and ray finned fish | Devonian |
| Land really gets going | Devonian |
| Devonian extinction | glaciation, possible meter impacts |
| Devonian extinction- species | mostly marine life, reef builders lost, brachipods, jawless fish, trilobites |
| Carboniferous- time | 360 mya |
| 1st reptiles | Carboniferous |
| Permian- time | 286 mya |
| 1st modern insects | Permian |
| winged insects | Permian |
| tropical climates, swamp forests | Permian |
| Permian extinction | cause unclear, "big one," Pangea formed |
| Permian extinction- species | 96% of all skeleton bearing marine species, trilobites, pelycosaurs |
| Periods of Mesozoic | Triassic, Jurassic, Cretaceous |
| Mesozoic- time range | 245-66 mya |
| Triassic- time | 245 mya |
| 1st mammals | Trassic |
| 1 lower jaw, 3 ear bones, differentiated teeth | mammals |
| Pangea breaks up | Trassic |
| Warm climate | Trassic |
| Synapsid therapods were ancestrak | Trassic |
| Jurassic- time | 208 mya |
| dinosaurs dominant | Jurassic |
| birds | Juraasic |
| Synapomorphy is not feathers(birds) | opposable hind toe, hollow bones |
| Modern birds | keeled breast bone, no teeth, no claws |
| Cretaceous- time | 144 mya |
| dinosaurs extinction | Cretaceous |
| Angiosperms | Cretaceous |
| insects diversify and social insects evolve | Cretaceous |
| Cenozoic- time range | 66- present |
| Early Cenozoic- time | 66 mya |
| 1st large mammals and primitive primates | Early Cenozoic |
| formation of Himalayas | Early Cenozoic |
| grasses are popular | Early Cenozoic |
| origins of most modern mammals, rodents | Early Cenozoic |
| North America isolated from Europe, Gondwanaland breaks up, Panama, Australia separates | Early Cenozoic |
| Late Cenozoic- time | 23.7 mya |
| development of most modern mammals and birds | Late Cenozoic |
| ape like ancestor of humans appear | Late Cenozoic |
| Late Cenozoic- extinction | big land and water animals get large and then die out |
| Pleistocene- time | 1.6 mya |
| ice age begins | Pleistocene |
| Pleistocene ice age | glaciations cause decrease in sea level and extinction |
| earliest humans | Pleistocene |
| Present- time | .01 mya |
| ice age ends | Present |
Created by:
ccorcoran19
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