Both cotton grass and tufted saxifrage are flowering plants that are found in the tundra biome.
The tundra is a cold biome. The organisms that are found in the tundra biome are those organisms that have developed certain adaptations that enable them to surmount the cold and survive in such biome.
The commonality between the cotton grass and tufted saxifrage is that;
Hence, both cotton grass and tufted saxifrage are flowering plants that are found in the tundra region.
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