D. temporal isolation. E. all of the above. Sympatric speciation differs from allopatric speciation in that A. sympatric speciation does not need geographical isolation to occur. B. Sympatric speciation does not need behavioral isolation to occur. C. Sympatric speciation does not need gametic hybrid sterility to occur.
Natural selection acts on A. an organism s phenotype.
B. a population of organisms. C. an organism s genotype. D. all of the above.