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Today is Wednesday, September 11 th , 2013

In This Lesson: Characteristics of Life (Lesson 3 of 4). Today is Wednesday, September 11 th , 2013. Pre-Class: What makes something alive? Can you come up with a list of qualities a living thing must have in order to be alive? Be prepared for an informal discussion.

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Today is Wednesday, September 11 th , 2013

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  1. In This Lesson: Characteristics of Life (Lesson 3 of 4) Today is Wednesday,September 11th, 2013 Pre-Class: What makes something alive? Can you come up with a list of qualities a living thing must have in order to be alive? Be prepared for an informal discussion. Having trouble? Try this: Convince me that a rock is not alive. Also, please turn in your Scientific Method worksheets.

  2. Today’s Agenda • Get a life… • …characteristics list. • Where is this in my book? • Academic: P. 17 and following… • Honors: P. 4-5

  3. Introducing… • Let’s do two introductory activity-like things: • Das Rad • Identifying Life Activity

  4. Das Rad • German Short Film • Things to think about: • What’s alive in the film? What is just “fictionally alive?” • What’s not alive in the film? • What’s the difference?

  5. Being alive… • There’s a lot of weird stuff out there. • Biologists have settled on eight characteristics that something must have in order to be considered alive. • Important: • It must have all eight. • Only seven? Too bad. Not alive.

  6. #1: Made of Cells • All living things are made of cells. • Unicellular beings have only one cell. • Multicellular beings have more than one cell.

  7. #2: Can Reproduce • Reproduction can be asexual (one parent) or sexual (two parents).

  8. #3: Has Genetic Code • DNA (or sometimes other forms) is found in almost every cell and ultimately controls your traits. http://www-nmr.cabm.rutgers.edu/photogallery/proteins/gif/dna.gif

  9. #4: Grow and Develop • All living things develop and grow during their lives (at least part of ‘em). • That’s why we don’t look like big overgrown babies. We look like adults…most of us… http://www.coachr.org/growth2.jpg

  10. #5: Need Materials/Energy • All living things need some kind of food or energy source. http://energybusinessdaily.com/wp-content/uploads/2009/10/Photosynthesis.jpg

  11. #6: Respond to Stimuli • Organisms respond to stimuli (signals either from their bodies or the environment). • Internal Stimuli – from within the organism. • External Stimuli – from outside the organism. http://man-over-board.com/wp-content/uploads/2009/10/baseball-head.jpg

  12. #7: Homeostasis • Homeostasis is the process of maintaining internal balance. • Body acidity, oxygen levels, and temperature (if you’re endothermic) must all be kept in balance. http://www.reptilechannel.com/images/blog/beardie-bask-500.jpg

  13. Homeostasis Example • Humboldt penguins are not cold-weather birds. • To deal with warm temperatures in their native South America, the bare skin near their beaks turns red. • The redness is due to increased blood flow to the area, allowing the outside air to cool them. http://twearth.com/images/penguins/humboldt-penguin-79da1c624ed78b95a6eb3c2a1fc041e2.jpg

  14. #8: Evolve • Anything that’s considered alive has to have evolved at some point. http://images.wikia.com/fossil/images/7/79/Geological_time_spiral.png

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