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Evolution
Mr. Ardito’s Living Environment Classes
Overview

• No change, no evolution
 • If individuals and species stayed
   exactly the same OR
 • If the environment stay...
Sources of Change

• Overproduction
• Genetic variation
• Struggle for existence (competition)
• Differential survival and...
Overproduction

• Organisms tend to produce more
  offspring than are necessary
• This allows a greater likelihood of any ...
Genetic Variation


• No two individuals in a species are
  exactly alike
• This is normal and desirable
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
Evolution
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Evolution

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A presentation for a middle school life science class on Evolution.

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Transcript of "Evolution"

  1. 1. Evolution Mr. Ardito’s Living Environment Classes
  2. 2. Overview • No change, no evolution • If individuals and species stayed exactly the same OR • If the environment stayed exactly the same • THERE WOULD BE NO EVOLUTION
  3. 3. Sources of Change • Overproduction • Genetic variation • Struggle for existence (competition) • Differential survival and reproduction
  4. 4. Overproduction • Organisms tend to produce more offspring than are necessary • This allows a greater likelihood of any of the offspring to survive to adulthood and reproduce
  5. 5. Genetic Variation • No two individuals in a species are exactly alike • This is normal and desirable
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