• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
3chapter17
 

3chapter17

on

  • 639 views

 

Statistics

Views

Total Views
639
Views on SlideShare
638
Embed Views
1

Actions

Likes
1
Downloads
14
Comments
0

1 Embed 1

http://ahsbiology.pbwiki.com 1

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    3chapter17 3chapter17 Presentation Transcript

    • Ch.17 Survey - The history of life
      • Fossil Record
      • Earth’s Early History
      • Evolution of Multicellular Life
      • Patterns of Evolution
      Kevin
    • Fossil Record
      • Fossil record can be used as evidence of Earth’s long history and the change of organisms as time passes.
      • Mostly found in sedimentary rock .
      • Shows that certain species have become extinct .
      • Relative dating compares its placement with those of others in other layers of rock.
      • Radioactive dating works by paleontologists’ measuring the amounts of certain isotopes that fossil contains.
      • Both technique above help to determine the age of fossils.
      Hyoung Min
    • Earth’s Early History
      • Six components of Earth’s early atmosphere: hydrogen cyanide, carbon dioxide, carbon monoxide, nitrogen, hydrogen sulfide, and water.
      • Contain little or no oxygen.
      • Rising Oxygen drove some lives to extinction while new organisms generated by it.
      • Ocean didn’t exist.
      Kevin
    • <Formation of the Earth> Organic molecules Photosynthetic oxygen Water Atmospheric oxygen Eukaryotes Sexual reproduction Multicellular organisms Kevin
    • Evolution of Multicellular life
      • Precambrian Time : Unicellular life started to change.
      • Paleozoic Era : Many types of marine life were altered into new forms of life.
      • Cambrian Period : Evolvement of animals with hard outer bone occurred.
      • Ordovician and Silurian Periods : Fishes having no jaw and land plants appeared as the first time.
      Hyoung Min
    • Precambrian Time -Unicellular life evolves. Hyoung Min & Kevin
    • Evolution of Multicellular life
      • Devonian Period : Animals began to move to the land.
      • Carboniferous and Permian Periods : Forests and winged insects evolved.
      • Mesozoic Era : Flower appeared.
      • Cenzoic Era : Mammals flourished everywhere.
      Kevin
    • Patterns of Evolution
      • Examples of patterns of Macroevolution : Mass extinction, Adaptive radiation, Coevolution, Punctuated equilibrium, and changes in developmental genes.
      • Through Mass extinction , a lot of species disappear very quickly.
      • By adaptive radiation , some species evolve into different forms.
      • During coevolution , the pattern of macroevolution reacts to the changes in each other overtime.
      Hyoung Min
    • Hox genes are the basis for major evolutionary changes. Hyoung Min