Answer:
It is situated in Northern Europe between tundra in the north and temperate mixed forests in the south and occupies about 2,156,900 km² (832,800 mi²) in Norway, Sweden, Finland and the northern part of European Russia, being the largest ecoregion in Europe.
Explanation:
D.) because it is fully up to date and usefull
Love, The jokester
hope it helped hehe
I believe the answer is: Language
The research subject for international researchers are most likely to be local citizens who are not speaking the researchers' languages. This often make it really hard for the researchers to obtain and interpret the data since both the subjects and observer cannot understand each other.
