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APSC 151 Life Questions And Answers
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when did pangea break up ~ during the triassic period the atlantic began to open during which period ~ the jurassic, polar ice caps had completely melted at this point the T rex is from what period ~ the cretaceous small mammals developed in what period ~ the cretaceous the cretaceous-terti...

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  • August 5, 2024
  • 7
  • 2024/2025
  • Exam (elaborations)
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APSC 151 Life Questions And
Answers

name some useful isotopes for radiometric dating


✓✓✓✓~ rubidium 87, thorium 232, uranium 235&238, potassium 40, Carbon 14




why would you date with potassium 40


✓✓✓✓~ it has a very long half life and can be found in many minerals




why would you date with carbon 14


✓✓✓✓~ it can date more recent geologic events because of its shorter half life




what makes the Hadean Eon special


✓✓✓✓~ there was no life on earth (4.6-4 billion years), this is the eon where the earths
crust and internal iron core formed,water formed in the first 100-200 million years
from out gasing and comets




when was the first life on earth


✓✓✓✓~ 4 billion years ago

, what is significant about the archean eon


✓✓✓✓~ there was constant volcanic activity, no oxygen, acidic oceans, and bacteria are
forming which then produce oxygen
*note oxygen only gets released at end of the archean




describe archaea


✓✓✓✓~ a cell without nuclei, and an extremophile it lived in high temps. and oxygen lacking
environments




archaea colonies are called


✓✓✓✓~ stromatalites




how long ago was the archean eon


✓✓✓✓~ 4-2.5 billion years ago




the proterozoic eon began what age


✓✓✓✓~ the age of oxygen, this caused a mass extinction of bacteria that fed on CO2




the great oxygenation event happened when

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