What are the species-forming agents of the biocenosis?

The feather grass steppe – feather grass – is a genus of perennial monocotyledonous herbaceous plants from the Cereals or bluegrass family;
Forest-tundra – shrubs, dwarf birch, willow, spruce, fir, larch, lichen;
Forest-steppes – oak, linden, chestnut, ash, bayrack forests;
Peat bog – small shrubs and sedge;
Spruce forest – spruce – a genus of trees of the Pine family;
Pine forest – pine – a typical genus of conifers, the Pine family;
Birch groves – birch – a genus of deciduous trees and shrubs of the birch family.

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