You are a biologist on a trip to an island in the south pacific. while on the island, you are allowed to collect dna samples from a local species of rat that resembles a species seen on a nearby continent. if your dna analysis also indicates the two species are closely related, you might conclude that the evolution of the two separate species was an example of speciation through
a. allopatric; dispersal
b. sympatric; dispersal
c. allopatric; vicariance
d. sympatric; vicariance