On the Origin of Species

What is natural selection, and how does this concept propel Darwin to entirely reconsider natural history? What is the essential difference between domestic selection and natural selection? Despite his clear admiration for advanced breeders, Darwin holds natural processes in higher esteem. Why?

How does the struggle for life between organisms lead to important checks on the propagation of various species? Why does Darwin emphasize the relationship between organisms as the most important of all influences in the process of natural selection? Why doesn’t he consider physical climate, for instance, as holding the same importance?

Darwin doesn’t believe an essential/fundamental distinction exists between species and varieties. Why? How does this definitional re-estimation of fundamental categories of biological inquiry implicate his dismissal of independent creation theory?