Answer : Option A
Explanation :
Lichens, which are made up to fungi and algae, grow on rocks. Many tundra animals, such as caribou, rely on lichens to survive; they dig through the layers of snow to eat lichens in winter. Mosses can grow on rocks or in very shallow soils. Many species have the ability to dry out and still grow back several years later, when more moisture may be available. Mosses can continue photosynthesis and growth in colder temperatures than the flowering plants of the tundra.
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