1. Which statement identifies the central idea of the text? O A Scientists know more about the biological functions of yawning than why some social species "catch" yawns
from each other.
O B Scientists believe that dogs are more likely to engage in contagious yawning because they are more
empathetic than most humans.
O C While scientists do not know what causes yawning, they have found that people who yawn more frequently
are often mentally and physically healthier.
D While scientists have limited knowledge about why we yawn, studies have shown that people and animals can
"catch" yawns from social interactions.