Paragraph 2
The
wrote about how human speech developed in his new
called, "The Language Puzzle". He says our brain increased in
over 1.5 million years ago. This changed the structure of our brain. An
developed that produced language. Another important
was the development of
that could make sounds, and therefore speech. This allowed humans to move all over the
. It meant humans could think of and plan
actions, and they could pass on
. The expert said language changed the human story
.
