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There are a few issues your question brings up. First, the idea that species evolve from simple to complex is actually not a prediction or inevitable consequence of evolution by natural selection. The terms "simple" and "complex" themselves are ill-defined. For instance, if you defined "complex" to be size of the genome, the most complex organism found to ...


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This question is interesting. First of all, I recommend you to look a little bit about the most popular definitions of species and, more importantly, how speciation can occur. I can picture a problem of hybridization when I think of your question. Since speciation takes many (plentiful) generations to happen, and as I can remember, can involve sympatric ...



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