Final Answer:
Mosses thrive in the Arctic tundra due to the abundance of sunlight during the summer and the presence of liquid water, which compensates for the short growing season. The cool temperatures and slower metabolic rates further contribute to their adaptation in this environment. So the correct option is B.
Step-by-step explanation:
Mosses thrive in the Arctic tundra due to a combination of factors. Abundance of sunlight (Option b) is a critical factor as the Arctic experiences long daylight hours during the summer, allowing mosses to undergo photosynthesis efficiently. This extended sunlight period compensates for the short growing season.
Additionally, the presence of liquid water (Option c) is essential for moss growth, and the top layer of soil in the Arctic tundra thaws during the summer months, providing mosses with the necessary moisture.
Furthermore, the Arctic's relatively cool temperatures and slower metabolic rates favor the growth of mosses, allowing them to adapt to the harsh environmental conditions. These factors collectively contribute to the success of mosses in establishing and thriving in the Arctic tundra ecosystem. So the correct option is B.