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Line 4: − For example, there are cases where two species are not capable of interbreeding, but each is capable of interbreeding with a third species.<ref name="spark">[http://www.sparknotes.com/biology/evolution/speciation/section1.html Speciation] (SparkNotes)</ref> − Additionally, a "species" is sometimes defined in such a way that groups of creatures that do not ''naturally'' interbreed (perhaps because of geological isolation) are classified as separate species despite the fact that they ''can'' interbreed.<ref name="spark"/> − Furthermore, many extinct species known only from fossils have been given species names, despite the impossibility of determining their capability of interbreeding. − + Line 15:
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Rearrange (no wording alterations except for a new heading). More editing coming...
However, the definition of "species" has changed over time and is sometimes problematic.
However, the definition of "species" has changed over time and is sometimes problematic.
==Origin of the term==
== Origin of the term ==
[[Linnaeus]], who introduced the classification system in the 18th century, originally intended "species" to refer to the biblical creation "[[baramin|kinds]]", but the modern definitions of species do not match the biblical kinds.
[[Linnaeus]], who introduced the classification system in the 18th century, originally intended "species" to refer to the biblical creation "[[baramin|kinds]]", but the modern definitions of species do not match the biblical kinds.
[[Charles Darwin]] wrote ''The Origin of Species'' {{years ago | 1859}} years ago, hoping to account for the diversity of plant and animal life with an entirely [[naturalistic]] explanation (see [[Theory of evolution]]).
[[Charles Darwin]] wrote ''The Origin of Species'' {{years ago | 1859}} years ago, hoping to account for the diversity of plant and animal life with an entirely [[naturalistic]] explanation (see [[Theory of evolution]]).
== Defining species ==
For example, there are cases where two species are not capable of interbreeding, but each is capable of interbreeding with a third species.<ref name="spark">[http://www.sparknotes.com/biology/evolution/speciation/section1.html Speciation] (SparkNotes)</ref>
Additionally, a "species" is sometimes defined in such a way that groups of creatures that do not ''naturally'' interbreed (perhaps because of geological isolation) are classified as separate species despite the fact that they ''can'' interbreed.<ref name="spark"/>
Furthermore, many extinct species known only from fossils have been given species names, despite the impossibility of determining their capability of interbreeding.
==Ring Species==
==Ring Species==