BIO 1150: HISTORY OF LIFE
29 Cards in this Set
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"Known to Science" means:
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Something that has been described and named
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Is diversity of life spread relatively even across the world?
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No, it is centralized across the equator (tropics), with the exception being vast deserts and oceans.
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when did most of the diversity start to come
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600 million years ago when o2 levels changed.
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Has earth always been so diverse?
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Yes, but not to the extent it has been in the last centuries
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How old is Earth?
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Approximately 4.5 billion years old
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Absolute age can be found using?
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Radiometric Dating
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Define: radiometric dating
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The use of naturally occurring radioactive isotopes to determine the numerical age of minerals rocks or fossils
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What kinds of things has influenced life on Earth?
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Temperature
Oxygen levels (20% now)
Land and Sea configurations (Plate Tectonics)
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What are some consequences of continental drift?
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Deepening of ocean basins
Reduction of shallow water habitats
colder and drier climate inland
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What are the three main Eon's in order of oldest to current?
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Archaean
Proterozoic
Phanerozoic (Current)
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What are the main Era's of the Phanerozoic eon?
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Paleozoic
Mesozoic
Cenozoic
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The Cenozoic Era consists of three periods: what are they?
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Paleogene, Neogene, and Quaternary
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The Mesozoic Era consists of three periods , what are they?
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Triassic, Jurassic, and Cretaceous
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What Periods are in the Paleozoic Era?
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1. Permian
2.Pennsylvainian
3. Mississippian
4.Devonian
5. Silurian
6. Ordovician
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Which period is older, Neogene or Pennsylvanian?
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Pennsylvanian
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Biodiversity is...
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variety of life in an area that is determines by the number of different species
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Biodiversity is determined by?
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Speciation - Extinction
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How many major extinction events are there?
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Five
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Cambrian explosion
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Huge amount of species start to evolve
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Does in increase in biodiversity mean a less extinction?
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Not necessarily, extinction never ceases, but has ups and downs.
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What is significant about the Permian Extinction?
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This is the biggest extinction event known.
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The end of the Paleozoic era was marked by?
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The Permian Extinction
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Mesozoic ended with what?
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Cretaceous Mass Extinction
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K-T extinction
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aka Cretaceous Tertiary Extinction
2nd largest mass extinction
killed dinosaurs by asteroid (crater found underwater off Yucatan, Mexico)
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How did mammals benefit from the K-T extinction?
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They took over large areas previously controlled by dinosaurs and flourished/evolved.
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What does "Humans are contingencies of History" mean?
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Without the K-T extinction, humans probably would have never came about.
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What was the last "modern" extinction?
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The Quaternary Extinction, bringing the disappearance of large mammals.
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The blitzkrieg hypothesis explains what?
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Why the Quaternary Extinction took place
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What time period had the greatest biodiversity?
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Now
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BIO 1150: HISTORY OF LIFE