Biology please help? Need urgent!

Posted on 2016-12-08 18:20:00 in Biology by KEN

Which of the following things is an example of gene flow? 

A.) an insecticide, like DDT, that improves reproductive success for only those individuals that have the genes for resistance 
B.) the post-bottleneck expansion of a population after the restriction has been removed 
C.) the selective removal of visually distinctive individuals via predation 
D.) pollen grains that can transport a gamete hundreds of miles to an isolated population

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