Hey there! :)
Baltic sea has brackish water because of the large amounts of runoff
Brackish water has more salinity than fresh water but less than that of seawater.
What are the choices? But Carbohydrates are the main component of fruit and vegetables.
I believe it is keeping these regions warm because the water is flowing from the SOUTHERN part of these regions, like, how it starts from the bottom of the US, (aka Louisiana, Mississippi), and it gradually flows upward, but hot always overrules cold, so the cold water that it is flowing into is becoming warmer as it passes into the warm water from the gulf of Mexico.
Hope that this helps :)
Where organisms are better adapted to their environments tend to survive and produce more kids!