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Lecture 4 Biology 2

Lecture 4 Biology 2 - Origin of Life Chapter 26 I What is...

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Origin of Life Chapter 26 I. What is Life? II. Ideas about the origins of life III. Geologic Record A. Continental Drift B. Dating fossils C. Mass extinctions What does it mean to be alive? Influenza virus CWD prion (protein) What does it mean to be alive? Definition of Life 1) 2) 3) Metabolism (use and production of energy) 4) Capable of information storage Human construct
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Origin of life Origin of earth: 4.6 billion years ago – First prokaryotes: 3.9 billion years ago – First eukaryotes: 2.1 billion years ago – First humans: 0.01 million years ago All life relies on DNA-RNA-protein system – Or slight variations Origin of Life Need to think about “Deep Time” (billions of years) All of human existence on earth (much more than our recorded history) is about 3.8 seconds out of a 24 hour day Some things to consider… Earth was formed ~4,600,000,000 yrs ago For a few hundred million years Earth was very hot and constantly bombarded from space At this point there was no liquid water, life was impossible
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Some things to consider… About 3,900,000,000 yrs ago, Earth was solidified enough and cool enough for liquid water Life apparently arose shortly thereafter The Origin of Life: Early Ideas – idea popular in the 1600-1700’s – living things come from the nonliving In 1668, Francesco Redi, an Italian physician, demonstrated that meat that was covered did not produce maggots This may have been the first true scientific experiment… Francesco Redi experiment with flies
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Extra-terrestrial Origins… The Raelians Raelians believe that humanity
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