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==Key Stage 4==
===Meaning===
[[Species]] is the smallest group in the [[Linnaeus Classification System]] and represents a group of [[Organism|organisms]] which can [[Reproduction|reproduce]] with on one another to produce [[fertile]] [[offspring]].
===About Species===
: Two [[organism]]s of different [[species]] cannot made [[fertile]] [[offspring]].
: Some [[organism]]s are closely related, but are not the same [[species]] so they can have [[offspring]] but the [[offspring]] are not [[fertile]]. These [[offspring]] are known as [[hybrid]]s.