Final answer:
Mosses and shrubs do not grow during Alaska's long winter weather months due to cold temperatures and lack of sunlight.
Step-by-step explanation:
During Alaska's long winter weather months, **mosses** and **shrubs** do not grow. This is because the cold temperatures and lack of sunlight make it difficult for plants to carry out photosynthesis, a process that is essential for growth. Mosses and shrubs are adapted to grow better in cold temperatures, but they still require some amount of light and warmth to thrive. In the Arctic tundra, mosses are the main vegetation due to their ability to grow on hard surfaces, slow down erosion, store moisture, and provide shelter for animals.