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Evolution of yawning

QuestionAnswer
Why do fish yawn? Fish yawn to force water backwash across the gills to clean the trash that block the filaments.
What are some theories on why humans yawn? Possible answers: 1. to cool the mammalian brain 2. to increase O2 levels to enhance mental performance. 3. Boredom or fatigue 4. Stress 5. To relax/stretch muscles
What are some theories on why animals yawn? Warning signals, signals of dominance, trigger for attack,
What are different animals that yawn? Snakes, fish, ostridge, owls, panthers, hippos, guinea pigs, dogs, and cats.
Does heart rate increase or decrease during a yawn? Increase. It can rise as much as 30 percent during a yawn.
Describe the evolution theory of yawning. Ancestors who were able to yawn and show off their teeth when needing to intimidate had an advantage over those who did not. Natural selection selected for those who could yawn.
What factor did the psychologists at Leeds University in England indicate is linked to contagious yawning? Empathy. Contagious yawning is associated with the same parts of the brain that deal with empathy. These regions, the precuneus and posterior temporal gyrus, are located in the back of the brain.
Created by: yawn
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