Fauna of Europe of the Baltic Sea has led to the evolution of many slightly divergent species, such as the Baltic Sea herring, which is a smaller variant of the Atlantic herring. The most frequent benthic species are "Saduria entomon" and "Monoporeia affinis", which is originally a freshwater species. A great part of its bottom is anoxic and without animal life. The Baltic Sea and North Sea are also home to a variety of marine mammals (common seals, grey seals). Europe contains several important freshwater ecoregions, including the heavily developed rivers of Europe, the rivers of Russia, which flow into the Arctic, Baltic,
Islands of the North Atlantic one of the regions which appoint a representative onto the committee of the World Universities Debating Council. Greenland, the Faroe Islands and Iceland would be included in the definition of IONA used in this context, while Newfoundland and Prince Edward Island would be in North America. However, none of these islands have yet participated in the World Universities Debating Championships. Otherwise, the term has achieved very little popular usage in any context. Islands of the North Atlantic IONA (Islands of the North Atlantic) is an acronym suggested in 1980 by Sir John Biggs-Davison to refer to a loose linkage of