Final answer:
The Arctic has larger river inputs due to melting glaciers, permaf_ost, and precipitation, supporting a variety of ecosystems, whereas the Antarctic is classified as a desert with minimal snowfall, leading to significantly less river input as it receives very low precipitation.
Step-by-step explanation:
When comparing river inputs between the Arctic and Antarctic regions, there is a clear difference due to the environmental and climatic conditions of both areas. The Arctic has a number of rivers that are fed by glaciers and melting permaf_ost, with a relatively higher amount of precipitation and runoff. Moreover, the surrounding land masses, with their vegetation, contribute to the river flow.
The Antarctic, on the other hand, is an ice-covered continent where precipitation is extremely low, and it is classified as a desert due to its minimal snowfall and lack of large river systems. The coastal regions of Antarctica receive some snow, which can feed small streams during the summer melt, but the interior sees very little precipitation. This stark contrast in hydrology is a direct reflection of the differing climatic conditions, with the Antarctic being much colder and drier, causing its river input to be considerably less than that of the Arctic.