Dr. ben dantzer, a faculty member here at michigan, studies red squirrels that live in the boreal forest. the boreal forest contains coniferous trees, which produce seeds but not flowers. in his study sites, white spruce is by far the most common tree species, and is a very important food resource for the red squirrels. which of the following can be used to describe the white spruce? (check all that apply)a. heterotrophb. dominant speciesc. primary producerd. angiosperme. autotrophf. cyanobacteriag. keystone species