Answer:
many different food chains connected together
Explanation:
The three rivers shown are the Volga 1, Ob 2 and Lena 3 all in Russia and the Danube is not shown because it is not in Russia but flows in behind the Adriatic Sea over to Germany and so is in a different part of Europe though all 4 rivers are major rivers in Europe.
This is True.
Southeast Asia has an abundance of natural resources, they're just not used as much as they should be.
