Final answer:
The exact number of conifer species that dominate the Boreal Forest is not explicitly stated in the provided reference material, although the Boreal Forest is primarily made up of evergreen coniferous trees like pines, spruce, and fir.
Step-by-step explanation:
The question concerns the number of conifer species that dominate the Boreal Forest, also known as taiga or coniferous forest. Based on the information provided, the Boreal Forest is predominantly composed of evergreen coniferous trees like pines, spruce, and fir, which are adapted to the cold and wet climate of the region found between 50° and 60° north latitude. These trees have needle-shaped leaves that allow them to photosynthesize earlier in the spring and retain their leaves year-round, offering a competitive advantage in the nitrogen-limiting soil of the boreal biome. While the exact number of dominant conifer species is not provided in the reference material, these trees constitute the majority of the forest's vegetation.