Seven species of snapping shrimp are found on either side of the isthmus of panama. what data provides good evidence that this is speciation by vicariance? a. that populations on opposite sides of the isthmus are reproductively incompatible. choice b., the dna of each current species is most similar to that of a species found on the opposite side of the current isthmus. choice c., the rate of evolution can be calculated because the populations have been separated for about 3 million years. choice d., that it takes about 3 million years for accumulation of enough mutations to result in new species of snapping shrimp.