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Classifying and Exploring Life

Classifying and Exploring Life. Characteristics of Life. Characteristics of Life – must have all to be considered alive. 1.) organized 2.) grow and develop 3.) reproduce 4.) respond 5.) maintain certain internal conditions 6.) use energy. Organization.

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Classifying and Exploring Life

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  1. Classifying and Exploring Life

  2. Characteristics of Life • Characteristics of Life – must have all to be considered alive. 1.) organized 2.) grow and develop 3.) reproduce 4.) respond 5.) maintain certain internal conditions 6.) use energy

  3. Organization • Cell – smallest unit of life - unicellular – made of only one cell - multicellular – made of two or more cells

  4. Growth and Development • Growth - Increase in size • Development – cell specialization

  5. Reproduction • Reproduction – one organism makes one or more new organisms. • Unicellular Organisms – divide and reproduce identical offspring - do not need another mate • Other Organisms – have specialized cells for reproduction - need a mate to reproduce

  6. Response to Stimuli • Respond to changes in the environment • Stimuli – internal – hunger, thirst - external – light, temperature

  7. Homeostasis • Homeostasis – ability to maintain steady internal conditions when outside conditions change - cells undergo homeostasis - hair on your body controls temp. - blood vessels dialate - paramecium – contractile vacuole pumps excess water

  8. Energy • Everything you do requires energy • Cells – need energy for transport, reproduce, and chemical reactions • Sun – where energy begins

  9. Characteristics of Life Table 1 Pg. 15

  10. Lesson Review Pg. 16 # ‘s 1 - 11

  11. Exploring Life • The Development of Microscopes • See details of living things that could not see with the unaided eye. • Anton van Leeuwenhoek – made 1st microscope • Robert Hooke – cells • Characteristics of microscopes - magnification – enlarge objects - resolution – clarity

  12. Types of Microscopes • Light microscope – use light and lenses to enlarge an image. - compound light microscope uses more than one lens. - living or nonliving specimens • Electron microscope – uses a magnetic field to focus a beam of electrons through an object or onto an object’s surface. - greater magnification and resolution than the light microscope. - transmission (TEM) – thin slices - dead - scanning (SEM) – 3-dimensional

  13. Using Microscopes • Health Care – surgery - labs • Other Uses – forensics - fossils - steel industry (impurities) - jewelers

  14. Lesson Review Pg. 31 # ‘s 1 - 8

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