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