Natural Selection Adaptations

Natural Selection Adaptations

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  • Thick Fur to Keep Warm By Amy Crook
  • Arctic Foxes:
  • Variations in a Population: There were two types of arctic foxes, ones with thick, white fur and ones with thin, white fur. 
  • Competition and Struggle for Existence: The arctic foxes with thick fur were able to stay warm in the extreme temperatures of the Arctic. On the other hand, the arctic foxes with thin fur struggled against the cold and often froze to death.
  • Survival of the Fittest: The arctic foxes that have thick fur are more fit for the extreme climate of the Arctic than arctic foxes with thin fur. This is because arctic foxes that have thick fur are protected and able to survive against the cold. They are also able to produce the most offspring (compared to arctic foxes with thin fur) and pass along their genes.
  • Evolution = Change Over Time: Since the environment selected the fittest animals to survive, the environment selected arctic foxes with thick fur to survive. Over time, the arctic foxes with thick fur survived the cold and reproduced, enabling their genes to be passed down. On the other hand, arctic foxes with thin fur begin to become extinct because they are not well adapted to the environment and cannot survive the cold. 
  • Evolution = Change Over Time (Continued): Eventually, the species of arctic foxes changed to only having thick fur because it is the more beneficial adaptation to have in the Arctic.
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