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,
History of the North Sea Europe that spanned the period from the end of the 14th century to about 1600, marking the transition between Medieval and Early Modern Europe. The majority of commerce took place via maritime shipping due to undeveloped roadways between the 16th and 18th centuries. The east coast of Great Britain operated several ports for intercontinental trade. The European coastal ports supplied domestic goods, dyes, linen, metal products, salt and wine. The Scandinavian and Baltic shoreline provided fish, grain, naval goods, and timber. The Mediterranean area traded dyes, premium cloths, fruits and spices. The Burgundian Netherlands, French Netherlands, Spanish Netherlands and Austrian