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4.1: Species, Communities and Ecosystems

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Define species according to the biological species concept.

Understanding: Species are groups of organisms that can potentially interbreed to produce fertile offspring.​
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1. Cannot test the reproductive isolation of fossils which must be classified into species based on morphology.

2. Even for living species, it is hard to determine if populations are reproductively isolated especially if they are geographically isolated.

3. Many species, especially prokaryotes, reproduce asexually and must be classified based on morphology and/or biochemical characteristics.