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   amount      animals      change      clearly      distances      elbows      elbows      evolutionary      farther      fewer      forests      habits      harder      longer      million      paws      prey      shape      species      today  
Research says climate changed dogs from resembling cats to how they look . Researchers say that 40 million years ago, dogs ambushed their like cats. The changing climate reduced the of in North America, so the and of dogs changed. New grasslands meant dogs had places to hide to ambush their prey. They changed their hunting styles and grew legs.

Scientists looked at how dogs changed by looking at the and teeth of that lived up to 40 years ago. The dogs' and teeth showed change. Dogs used to have elbows like those of cats. The front swivelled so they could grab their prey. Elbows changed in dogs to let them run . This meant they could chase their prey over long . The teeth in dogs became so they could hold on to prey.

 
 

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