Why is allopatric speciation much more likely to occur than sympatric speciation?

Why is allopatric speciation much more likely to occur than sympatric speciation? Give an example of allopatric speciation that is not in your book. Use outside sources to do research on the question as needed and cite appropriately (APA)The post Why is allopatric speciation much more likely to occur than sympatric speciation? first appeared on Nursing School Essays.