Which ecosystem in the far northern russia runs parallel to the arctic shoreline?

The Tundra ecosystem in the far northern Russia runs parallel to the 'arctic shoreline'.

Explanation:

About 1/5th part of the entire Russian mainland lies past north of the Arctic Circle. It is because of this orientation of northern Russia, the ecosystem that exists here is a Tundra ecosystem that is characterized by long winters, short growing seasons, soils laden in snow for most period of the year, minimal soil nutrients, negligible vegetation, scarce human and animal population, etc.

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen

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