What are some important changes in the anatomy of humans that distinguished them more and more from other primates such as apes according to the author?

What are some important changes in the anatomy of humans that distinguished them more and more from other primates such as apes according to the author? How do we know about these changes? What does climate change have to do with any of this? Also, where do the brain and first words come in? How do you explain the evolution of language? Or is language not about evolution after all? Does this text help you argue for the need to include both physical/biological anthropology and the study of linguistics in anthropology?