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Studying Life: What does it mean to be alive?

Studying Life: What does it mean to be alive?. Objectives: Describe some characteristics of living things Explain how life can be studied at different levels Question: What does it mean to be alive? What do all living things have in common?

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Studying Life: What does it mean to be alive?

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  1. Studying Life: What does it mean to be alive? Objectives: • Describe some characteristics of living things • Explain how life can be studied at different levels Question: • What does it mean to be alive? • What do all living things have in common? • Are there any non-living objects that have living characteristics? Is this fire alive???

  2. 1. Cells • All living things are made up of cells • Cells are the smallest units of an organism that can be considered alive • Cells can grow, respond, and reproduce • Despite their small size, they are complex and highly organized • Unicellular organisms = 1 cell • Multicellular = many cells Stem Cells

  3. 2. Reproduction • All living things produce other living things • There are 2 types of reproduction =Sexual: cells from 2 different parents unite to form first cell =Asexual: New organism as a single parent

  4. 3. Based on a Genetic Code • Offspring resemble their parents • Asexual reproduction results in offspring with identical traits • Sexual reproduction creates variety with similar features • DNA: carries directions for inheritance

  5. 4. Growth and Development • All living things grow at some point in their lives • For many single-celled organisms growth is simply an increase in size • For multi-cellular organisms they develop from one cell into many through cell division • As the cells develop they take on different rolls Nerve Cell Skin Cells Blood Cells

  6. 5. Materials and Energy • Organisms need materials and energy to stay alive • Metabolism: process of breaking down materials for energy that is needed to make other vital materials • Autotrophs: use sunlight as their source of energy • Heterotrophs: consume other organisms for energy Autotroph or Heterotroph?

  7. 6. Response to Environment • Organisms detect and respond to stimuli in the environment

  8. 7. Maintain Internal Balance • Homeostasis: process of maintaining a stable internal environment (Temperature)

  9. 8. Evolution • Change of a species over time • Individuals do not evolve • Groups of organisms can change

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