Question

according to the passage, what could scientists learn about from studying yawns? reasons why we get sleepy cures for serious illnesses secrets to becoming a hero ways to listen to boring stories

Explanation:

To solve this, we analyze the options. Yawning is related to sleepiness (as yawning often occurs when sleepy). "Cures for serious illnesses" is unrelated to yawning studies. "Secrets to becoming a hero" and "ways to listen to boring stories" are irrelevant to yawning research. So the correct option is about reasons for sleepiness.

Answer:

A. reasons why we get sleepy