Question

1. which statement identifies the central idea of the text? a. scientists know more about the biological functions of yawning than why some social species \catch\ yawns from each other. b. scientists believe that dogs are more likely to engage in contagious yawning because they are more empathetic than most humans. 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

Explanation:

The statement should summarize the main - idea about scientists' knowledge on yawning and contagious yawning in people and animals. Option A focuses only on scientists' knowledge of yawning functions vs. contagious yawning. Option B makes an unsubstantiated claim about dogs' empathy compared to humans. Option C has no basis as there's no link between yawning frequency and health in the general context. Option D correctly states the limited knowledge about why we yawn and the evidence of contagious yawning in social interactions.

Answer:

D. While scientists have limited knowledge about why we yawn, studies have shown that people and animals can "catch" yawns from social interactions