Powerpoint 10 - History of Life on Earth

Powerpoint 10 - History of Life on Earth - History of life...

Info icon This preview shows pages 1–2. Sign up to view the full content.

History of life on Earth The history of life spans five intervals of geologic time Outline: 1. Key concepts 2. One can view the history of life as a phylogenetic tree 3. The geologic record 4. Mass extinctions 5. History of Life 6. Key Terms 7. Conclusions Key Concepts: Life originated more than 3.8 billion years ago All of the compounds necessary for life could have formed spontaneously under conditions that existed on the early Earth The history of life spans five intervals of geologic time Divergence led to two prokaryotic lineages and to the eukaryotic divergence Certain environmental insults have had profound impacts on the direction of evolution 5 intervals of geologic time: 1. The Archean Era (4600 – 2500 mya): Oxygen producing cells appear 2. The Proterozoic Era (2500 – 540 mya): The first eukaryotes appear 3. The Paleozoic Era (542 – 250 mya): The occupation of the land 4. The Mesozoic Era (250 – 65 ms): The age of reptiles 5. The Cenozoic Era (65 – today): The age of mammals Microfossils
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Image of page 2
This is the end of the preview. Sign up to access the rest of the document.
  • Spring '08
  • Reichler
  • Biology, Evolution, Extinction event, Cretaceous–Tertiary extinction event, Geological history of Earth, Proterozoic

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern