Although all of the following may have been critical to the development of an expanding brain, which do scientists believe would have contributed most directly to brain growth?

Question

Although all of the following may have been critical to the development of an expanding brain, which do scientists believe would have contributed most directly to brain growth?​

Quizplus · Accepted Answer

Scientists believe that a genetic mutation resulting in a smaller jawbone and smaller facial muscles would have contributed most directly to brain growth because it would have freed up more energy for brain development, as less energy would be needed for chewing and maintaining larger facial muscles. This is known as the expensive tissue hypothesis. The other choices may have indirectly contributed to brain growth, but not as directly as the genetic mutation affecting the jawbone and facial muscles.

Although All of the Following May Have Been Critical to the Development