Is an essential part of russia's hinterland, making up three-fourths of its land and providing a large proportion of its raw materials.

a. moscow
b. siberia
c. murmansk
d. st. petersburg

The organ that has two atria and one ventricle is the

Rainbow trout is non- native to the united states. however this species is breeding with the native gula yltrout acientistrecently observed that the hola trout were becoming exitinct what is the cause of their extinction

Can someone me with this plz? ! i'm putting 20 points on it!