Characteristics Of Living Things
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Characteristics Of Living Things






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    Characteristics Of Living Things Characteristics Of Living Things Presentation Transcript

    • Characteristics of Living Things
    • Biology is the Study of Life
      • Biologist study the interactions of life.
        • Entomologist
        • Histologist
        • Ornithologist
        • Ichthyologist
        • Etc…
    • How does one define life?
      • There are 6 different Characteristics that an organism must have to be considered living.
    • 1. Cells/Organization
      • Living things are highly organized: they are all composed of tiny living units called cells .
      • Cell  tissue  organ  organ system  organism
      • Some organisms consist of only a single cell, others have trillions.
        • Multicellular
        • Unicellular
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    • 2. Energy Transformation
      • Living things take in energy and change it into different forms.
      • The transformed energy is used to power all of life’s processes (growth, etc.)
      • Metabolism is the term for all of an organism’s bio-chemical reactions and energy transformations.
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    • 3. Reproduction
      • Individual organisms die, but the species continues because of reproduction .
      • Reproduction without genetic contribution from two parents is called asexual.
      • Sexual reproduction produces offspring with genetic material from both parents .
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    • 4. Growth (important!)
      • Living things grow over their lifetimes.
      • Mitosis -cell division
      • Single - celled organisms increase their volume and multicellular organisms add to the number of cells in their body.
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    • 5. Response to the Environment
      • Living things react to and interact with factors in their surroundings:
        • Abiotic factors- non-living
        • Biotic factors -living
      • These reactions can take place almost instantly or over a period of hours, days, months, years, or even generations.
    • 5. Response to the Environment
      • When presented with the proper stimulus , a living organism will respond .
      • Can occur at the cellular level ( homeostasis )
      • A complex set of responses is called behavior .
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    • 6. Adaptation/Evolution
      • Over (generally) long periods of time (several to thousands generations, depending on the organism), environmental pressures may lead to permanent genetic changes in groups of organisms.
      • This process is called evolution .
      • These changes, or adaptations, help the organism survive and reproduce in its environment.
      Image from educational_trips.html
    • Any Questions?