History Life on Earth

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					HISTORY OF LIFE ON EARTH AND
CLASSIFICATION OF ORGANISMS
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                                                                     Biological Changes




                                                                      (BIO EVOLUTION)

Universe       Origin of              Origin of                                           Biodiversity
               the                    Life on
10 bya         Earth/                 Earth and a                                         On
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                                                                                          Earth
                                      3.5 Bya
               System
               4.6 Bya




           1,000,000,000 years = 1 B.Y.
           Bya = Billion years ago
      3.5 Billion Years Ago                                                                              Bitter Springs
                                                                                                         Chert (in Red)


       Oldest known life
              Prokaryotic cell
                     No nucleus
              Resembles Cyanobacteria from today




                                                                      http://www.ucmp.berkeley.edu/precambrian/bittersprings.html

Ancient Fossil Bacteria : Pictured above are two kinds cyanobacteria from the Bitter Springs Chert.
On the left is a colonial chroococcalean form, probably Myxococcoides minor, and on the right is the filamentous Palaeolyngbya.
1 BYA-1.8 BYA
 First Eukaryotic Cells
   1 BYA
      Fossils with preserved nuclei




                                  http://www.ucmp.berkeley.edu/alllife/eukaryotafr.html
600-560 MYA
 Formation of the Ozone Layer
    Cyanobacteria now producing much of the world’s
     Oxygen (O2).
    UV rays hit oxygen and cause formation of Ozone (O3).
    Now that Ozone is blocking UV rays…Life can move
     onto land




                                 http://www.albany.edu/faculty/rgk/atm101/ozone.htm#form
3.5 Bya   1 Bya                                  Today



             560 MYA
             Ozone Layer Forms




                  1,000,000,000 years = 1 B.Y.
When did Humans come
along?
 Homo sapien sapiens (modern man)
  first appears ~1.8 MYA (MILLION not
  Billion)


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3.5 Bya   1 Bya                                      Today



             560 MYA                             1.8 MYA
             Ozone Layer Forms                   Homo
                                                 sapien



                          1,000,000,000 years = 1 B.Y.
Classification
 All living and extinct organisms are organized
  into units called TAXONS
 6 Kingdom Classification:
 Bacteria
 Archaea
 Protists
 Plants
 Fungi
 Animals (Invertebrates and Vertebrates)
Classification — (Linneaus System)


Kingdom
Phylum
Class
Order
Family           Taxonomic
Genus            unit/ Taxon
Species
Bacteria and Archaea
 Are unicellular prokaryotes (no nucleus)
 Primitive (simple)
 Archaea live in extreme conditions (ex: in
  lava flows, ice)

                                                     Archaea in
                                                     deep sea
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Protists
 Are unicellular or multicellular
  eukaryotes (with nucleus)
 Includes amoeba, algae (kelp)

                                    Volvox
                                                                                Amoeba
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  Plants
 Are multicellular Eukaryotes
 (with nucleus)
 Can Photosythesize
(autotrophs)

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                                                                   Amoeba
Fungi
 Are multicellular eukaryotes (with nucleus)
 Absorb nutrients from the surrounding
  (heterotroph)



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Animals
 Eukaryotes and heterotrophs
 Invertebrates have no backbone
 Vertebrates have backbone              a d na ™emi Tkciu Q
                                              ros serpmoced
                                   . eru tci p sih t ee s o t de deen e ra
   Animals
 Invertebrates - can be motile (move) or sessile
   (stationary);
 Body symmetry can be present/absent; if present, body
   can show radial symmetry or bilateral symmetry;
 Body can be divided
 into segments of same
type or different types
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   Animals
 Vertebrates - includes fishes, amphibians,
  reptiles (includes birds), and mammals
  (have mammary or milk glands)



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posted:9/13/2012
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