Another question: how does extinction determine the world’s current biodiversity? This was a question on the test and I don’t understand. The question was “The two processes that determine the world’s current biodiversity are ______.” I said “allopatric and sympatric speciation” because this process plays a part in new species being developed considering geographical and behavioral separation between organisms. The answer he wanted was “extinction and speciation.” I can understand the speciation aspect, but how does extinction contribute to a greater biodiversity? Doesn’t extinction take away from biodiversity? For example, the K-T event wiped out a bunch of species at one time (I think it was like 75-90%…maybe that’s the Permian). Regardless, wouldn’t the result be one a very small number of species? So wouldn’t this actually DECREASE biodiversity? I’m confused…

Via:pdsblogs. org

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