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What is life??

What is life??. Alive?? More than just a list?? Materialism vs vitalism Energy capture/use Irritability Grow/reproduce Evolve/adapt. DNA, Energy & Life. All organisms have DNA…why?? Energy used to organize Life Levels of organization cells---biosphere Energy used, matter is recycled!.

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What is life??

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  1. What is life?? • Alive?? • More than just a list?? • Materialism vs vitalism • Energy capture/use • Irritability • Grow/reproduce • Evolve/adapt

  2. DNA, Energy & Life • All organisms have DNA…why?? • Energy used to organize Life • Levels of organization cells---biosphere • Energy used, matter is recycled!

  3. DNA, Energy & Life • Ecology • Diversity…so many?? • 6 Kingdoms…now! • How many Species? • Future of Diversity? • Similar but different?

  4. Systems Organism Population Community Ecosystems biosphere Atoms Molecules Organelles Cells Tissues Organs Levels of biological organization

  5. Interdependence of all life • Energy flows from sun • To producers (autotrophs) • Which are consumed • Decomposers recycle the molelcules but not the energy • Life exists at the expense of other life…

  6. Unity in diversity?? • Biochemical/cellular threads in life’s tapestry =1.5 million species to date!! • archaebacteria • Eubacteria • Protista • Fungi • Plants • animals

  7. Evolution • Change…change…& • Why so much diversity? • Fossils?? • What do mutations mean? • Natural Selection

  8. Doing Science • Knowledge vs Certainty …why it matters • Reductionism…? • Skepticism…inquiry? • Controls & variables • Open epistemology!! • Limits of science…?

  9. The Scientific Method • Observations=seeing? • Explanation(s)..if/then • Test predictions • Revise or accept • Repeat…why? • ‘Just a theory’??? reliable…but not absolute!!!

  10. How would you evaluate her? The human condition is complex and there are many ways of ‘knowing’!

  11. What is an hypothesis? Explain nat’l selection List 4 characteristics of living things? What is reductionism? Metabolism=? Energy is ‘used up’ but matter is…..? List 6 kingdoms List levels atoms to ecosphere Quiz

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