I want to know the answer to the following question:
Why did Darwin introduce a new chapter in On the Origin of Species in the sixth edition?
All the background I'm provided with is that "In the sixth edition Darwin inserted a new chapter VII (renumbering the subsequent chapters) to respond to criticisms of earlier editions, including the objection that many features of organisms were not adaptive and could not have been produced by natural selection.". Is that enough to answer the question?