Question

1. which of the following describes the authors main purpose of the text?

a. to explore why people and animals yawn and how yawns are contagious
b. to prove that yawning is more of a biological function than a social one
c. to explain why scientists know so little about why humans yawn
d. to support the theory that yawning helps cool down the brain

Explanation:

Typically, texts on yawning explore reasons for yawning and the contagious - ness aspect. This is a common theme in studies related to human and animal behavior. The other options are more specific and not as encompassing as option A.

Answer:

A. to explore why people and animals yawn and how yawns are contagious