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accordingly active Africa agree America Amerindian ancient animals answer approaches Asia Australia basic believe better biogeographic birds called centers Central certain China clear close common conclusion connected continued contrary course cultural deal detail direction discussion dispersal distribution East Eastern essentially eventually evidence evolution example fact factors finally follows form-making former forms fossil fully genera genus geographic Guinea hand happen Hawaii immediately important interest Island Italy kind least less living massing matter means migrations nature normal North Northern Note once origin Pacific particular plants Pleistocene Polynesia possible precisely present problem prove question races range reach reader readily reason records reference regard score sector sense Siberia South Southern space species stand standard student suggest surely thought track true turn understanding Western whole World yield