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Chapter 13outlinept2
 

Chapter 13outlinept2

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    Chapter 13outlinept2 Chapter 13outlinept2 Presentation Transcript

    • First Life
      • The first life forms on Earth did not need oxygen.
      • Who or what were these organisms?
      • How about _________ !!!!!!!!!!!!!!!!
      • _________ are not complete organisms. They need other organisms to provide nutrients to live
      • SO!!!!!!!!!!!!!!!!!
    • 2.5 b.y.a.
      • Oxygen build up primarily due to organisms that perform photosynthesis.
      • These photosynthetic organisms are called _________ .
      • Today cyanobacteria live in all green plants and are called?
      • _________
      • Most of the first oxygen reacted with iron forming _________ (rust).
      • Once the available iron finished reacting, oxygen began to accumulate in the atmosphere.
      • _________ began to accumulate in the atmosphere about 2.5 billion years ago.
      • Ocean dwelling organism appeared in the fossil record about 540 million years ago (m.y.a.).
    • Precambrian Fossils
      • _________ – are layered mounts of calcium carbonate, which are the remains of material deposited by algae.
    • Paleozoic Era: Life Explodes
      • The Paleozoic ear is made of several periods including:
      • Permian – youngest period
      • Pennsylvanian
      • Mississippian
      • Devonian
      • Silurian
      • Ordovician
      • Cambrian – oldest period
    • Early Paleozoic History
      • During the Cambrian, Ordovician, and Silurian periods, the vast southern continent of _________ included:
      • South America
      • Africa
      • Australia
      • Antarctica
      • India
      • And perhaps China
    • North America
      • was most likely on or near the equator.
      • had no living things, plant or animal.
      • Later on North America collides with Africa beginning the formation of the Appalachian Mountains and continues for 200 million years.
      • By the Silurian period, shallow seas or epicontinental seas covered much of North America.
      • Many barrier reefs prevented circulation between the shallow marine basins and the open ocean.
      • As the water evaporated salt and gypsum deposits formed.
    • _________ 2.7 b.y.a
      • We now have the basic part to make all forms of life
      • We just need to make things more and more complex
      • _________ must adjust to do different kinds of jobs
    • What is the name of the 1 celled life form in the oceans?
      • _________
      • represents all animal life to come
      • _________
      • represents all plant life to come
      Plankton – 1.8 b.y.a.
    • Colonial organisms
      • _________ critters that are not very specialized
      • _________
      • _________ - (polyps)
      • _________
    • Early Paleozoic Life
      • Life at this time is restricted to the oceans. All forms of life were invertebrates.
      • 1- _________ – bottom dwelling scavengers. They occurred in more than 600 types. They were the _________ form of life at this time.
    • Paleozoic Era - Cambrian period
      • Dominant form of life is the trilobite
      • Body segments
      • Head shield
      • Tail shield
      • 2 – _________ – these shelled organisms replace trilobites as the dominant form of life. Except for one species, brachiopods are extinct today.
      • Their larvae were free swimming, but like oysters and clams, these shelled animals were attached to the ocean floor.
    • Paleozoic Era - Cambrian period
      • brachiopods are present [ forerunner to the _________ ]
      • 3 – _________ – cousin to the octopus and squid. These highly mobile _________ were the major predator of the time.
      • Cephalopods were the first large animal on Earth.
      • By the end of the Ordovician many organism were able to secret material to form hard parts such as an exoskeleton.
    • Paleozoic Era –Ordovician 505 – 440 m.y.a.
      • cephalopods ( _________ )
      • oldest one is the _________
    • Late Paleozoic
      • The tectonic reorganization of Earth’s landmasses into one supercontinent called _________ .
    • Late Paleozoic History
      • North America collides with Africa closing the narrow sea that separated them.
      • As this collision continues the rest of the Northern Hemisphere continents join them.
      • This resulted in the formation of the northern continent of _________ .
      • By the Permian, Gondwana has traveled north and collides with Laurasia.
      • By the end of the Paleozoic _________ is formed.
    • Late Paleozoic Life
      • Plants living at the water’s edge move onto the land.
      • These plants were leafless vertical spikes about the size of your index finger.
      • By the end of the Devonian Period (40 million years later) there were forests.
      • The first forests were in _________ …..
    • _________ First primitive fish _________
    • Paleozoic Era – Silurian 440 – 410 m.y.a.
      • Appearance of _________ water fish.
      • 1st land critters appear and were?????
      • _________
      • Including: _________
      • _________
      • _________
      • _________
      • _________
    • Paleozoic Era - Devonian Known as the AGE OF FISHES
      • _________
      • _________
      • _________
      • _________
      • _________
      • all modern fish
      • Amphibians diversified on land because they had no major competitors.
      • By the Pennsylvanian period large tropical swamps extended across North America, Europe, and Siberia.
      • Coal deposits today resulted from these swamps.
    • Lobe fin became the ancestor of _________