Evolution is central to vertebrate biology because it provides a principle that organizes the diversity we see among living vertebrates. Also it helps to fit extinct forms into the context of living species. Classification, initially a process of attaching names to organisms, has become a method of understanding evolution. F. Harvey Pough, et al., Vertebrate Life, 7^th edition A) Argument; conclusion: It provides a principle ... among living vertebrates. B) Argument; conclusion: Classification ... a method for understanding evolution. C) Nonargument. D) Argument; conclusion: Evolution is central to vertebrate biology. E) Argument; conclusion: It helps to fit ... the context of living species.

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The passage presents an argument that evolution is central to vertebrate biology. It provides evidence for this claim by stating that evolution organizes the diversity we see among living vertebrates and helps us understand extinct forms in the context of living species. The rest of the passage supports this main argument, making it the best choice.

Evolution Is Central to Vertebrate Biology Because It Provides a Principle