Biology

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Author:
8thgradeclass
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266665
Filename:
Biology
Updated:
2014-03-16 19:19:16
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  1. occurs when minerals carried by water are deposited around a hard structure.
    premineralization
  2. forms when flowing water removes all of
    the original tissue, leaving an impression.
    natural cast
  3. what records the activity of an organism
    trace fossils
  4. Amber-preserved fossils are organisms that become trapped in tree resin that hardens after the
    tree is buried.
    original remains
  5. Preserved remains form when an entire organism becomes encased in material such as ice.
    original remains
  6. estimates the time during which an organism lived. It compares the placement
    of fossils in layers of rock. Scientists infer the order in which species existed.
    relative dating
  7. atoms of an element that differ in
    their number of neutrons.
    isotopes
  8. the amount of time it takes for
    half of the isotope to decay.
    half life
  9. can provide the relative age of a rock layer.
    existed only during specific spans
    of time. occurred in large geographic areas
    index fossils
  10. last tens of millions of years.
    Periods
  11. last several million years.
    epochs
  12. The most widely accepted hypothesis of Earth’s origins
    nebula hypothesis
  13. two organic molecule hypotheses.
    • Miller-Urey Experiment 
    • Meteorite Hypothesis
  14. different hypotheses of early cell structure.
    • iron-sulfide bubbles hypothesis 
    • lipid membrane hypothesis
  15. The oldest known fossils
    marine cyanobacteria.
  16. provide evidence of early colonies of life.
    stromatolites
  17. a relationship in which one organism lives within the body of another.
    endosymbiosis
  18. an advantage of sexual reproduction
    genetic variation
  19. may have led to the evolution of multicellular life.
    sexual reproduction
  20. Multicellular organisms first appeared during the
    Paleozoic Era
  21. led to a huge diversity of animal species.
    Cambrian Explosion
  22. era is known as the Age of Reptiles.
    Mesozoic Era
  23. mammals with flexible hands and feet, forward-looking eyes and enlarged brains.
    primates
  24. lemurs, lorises, tarsiers
    Prosimians
  25. New World Monkeys, Old World Monkey, Hominoids
    •Anthropoids
  26. Hominids, Great Apes, Lesser Apes
    Hominoids
  27. the oldest living primates.They are mostly small and nocturnal
    Prosimians
  28. humanlike primates
    Anthropoids
  29. means walking on two legs.
    Bipedal

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