How are southern appalachian (u. s. a.) and southwestern caucasus (russia) forests similar?

The correct answer is (B) They are both Northern Hemisphere, warm-temperate forests. Although Appalachian (U. S. A.) and Southwestern Caucasus (Russia) have common origins, both northern hemisphere warm-temperature Tertiary forests, they have developed differently. The similarities also include the species-to-genus, species-to-families ratios and the floristic composition.