Population of animals is split in half by a river. Before speciation is Sted, the two halves are rejoined when a drought causes the river to run would this impact the two populations? A. Speciation would still occur, because the two halves would be too different genetically to interbreed.
B. The likelihood of speciation would decrease as genes were shared between the two groups.
C. Traits that had developed through mutation would still exist only in one of the halves.
D. The two halves would be reproductively isolated.​