Characteristics of Living Things

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Characteristics of Living Things
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All Living Things Share Common Characteristics

• What do you think are characteristics that make
  something living?

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Living Things Are Made Up of Cells

• Smallest living unit
• Unicellular/Multicellular
• Complex, highly organized

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Based on Universal Genetic Code

• Stores info needed to live, grow and reproduce in
  DNA
• Info copied ? passed on to offspring
• Almost identical in every organism on Earth

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Living Things Reproduce

• Sexual Reproduction
• Sex cells from 2 parents unite (plant/animal)
• Asexual Reproduction
• Single organism produces clone of itself
  (bacteria)

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Growth and Development

• Cells begin to differentiate
• Look different
• Perform different functions

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Maintain Stable Environment

• Keep internal environment stable even though
  external conditions change
• Homeostasis

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Respond to Their Environment

• Detect and respond to signals (stimulus) from
  their environment

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Obtain and Use Material/Energy

• Energy needed to grow, develop, function and
  reproduce
• Metabolism- sum of all chemical reactions in an
  organism

SUN is main source for all life
6O2 C6H12O6 6CO2 6H2O
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Taken as a Group, Living Things Evolve

• Change over time
• Links all life forms to common origin
• Evidence found in living/fossil organisms
• DNA

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LIFE IS ORGANIZED ON MANY LEVELS
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• Atoms
• Molecules
• Organelles
• Cells life starts here
• Tissues
• Organs
• System
• Organism
• Population
• Community
• Ecosystem
• Biosphere

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