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Chapter 11 - Systematics and ClassificationDarwin wrote "On the Origin of Species" and by doing so launched a modern era of biology and its study of evolution. A "biological species" comes from "reproductive isolation" of populations. That is pretty easy to understand but there are millions of organisms that we can't really test for successful interbreeding. There are others that freely hybridize but that seem so different that they are assuredly different. But there may also be organisms that look alike but that cannot interbreed. So, what, really, is "a species." It isn't quite as simple as it might have seemed at first.
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