Lamarck's Theory

Lamarck's Theory

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  • Look! A cheetah! Although most of you may think this is how the cheetah has always looked, you are wrong!
  • Jean Baptiste de Lamarck was one of the first scientists to discover that living things change over time, and that organisms are able to adapt to their environment. He had a theory on how this is possible.
  • Hundreds of years ago, the cheetah didn't have a tail, or the grippy pads on it's feet. Instead, it had wings that were completely useless to the cheetah.
  • Without the long tail, the cheetah had very poor balance and would often fall off of logs they would walk across, and cut their paws.
  • The cheetah's wings  that are useless to them, eventually disappeared, known as the "Law of use and Disuse"
  • Stepping on several rocks allowed the cheetahs paws to toughen up, developing pads on them for traction.
  • After a lot of time stretcing and pushing it's butt out, the cheetah developed a long tail to help it balance.
  • All of these adaptations the cheetah made to make their lives easier was inherited by their offspring.  This is known as the "Law of Acquired Characteristics". 
  • Jean Baptiste de Lamarck's theory has been proven untrue, and Darwin's  Theory of Evolution by Natural Selection is what is currently believed to be true.
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