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Organisms & Life

Organisms & Life. What is life?. All living things are composed of cells. Cell is the smallest unit of living matter some living things are composed of a single cell others of collections of specialized cells Multi-celled things can grow by duplicating cells - How does growth occur?.

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Organisms & Life

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  1. Organisms & Life

  2. What is life?

  3. All living things are composed of cells • Cell is the smallest unit of living matter • some living things are composed of a single cell others of collections of specialized cells • Multi-celled things can grow by duplicating cells - How does growth occur?

  4. Living things have self regulating metabolisms • Various functions of a living things must work together, in cooperation for the thing to live - homeostasis (automatic tendency to maintain appropriate internal environment) • The mechanisms that accomplish this are called…homeostatic mechanisms

  5. Living Things Move • If nothing else internal movement but… • Do plants move?

  6. Respond to Stimuli • All living things respond to stimuli… • Changes in environment, fear, hunger, temperature, attraction, revulsion...

  7. All things reproduce • All things die • species are perpetuated through reproduction • reproduction • reproduction • reproduction • reproduction • reproduction • reproduction • reproduction • reproduction

  8. All living things adapt to their environment or...

  9. Natural Selection • Charles Darwin and the HMS Beagle • The Origin of Species • …surmised that present forms of life have descended from previous forms of life…changes in form were a result of small changes being selected for by nature • Changes were selected because they allowed the species to be more successful...

  10. IN ANY POPULATION, MEMBERS OF THE POPULATION DISPLAY SOME VARIATION FROM ONE ANOTHER

  11. MORE ORGANISMS ARE BORN THAN SURVIVE TO REPRODUCE

  12. RESOURCES ARE LIMITED, THEREFORE MEMBERS OF A POPULATION MUST COMPETE FOR SURVIVAL

  13. SURVIVORS LIVE TO REPRODUCE AND PASS THEIR GENETIC CODE ON TO THE NEXT GENERATION

  14. Life can be studied or viewed at different levels...

  15. Next time... • Read Chapter 2 • Read Learning Objectives and Key Concepts • Science is a way of thinking pp 24 - 26 • Inductive/Deductive Logic p 27 • Scientific Method pp 27 - 32

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