What climatic region is characterized by being covered primarily by forest?

The climatic region that is characterized by being covered primarily by forest is indeed the Tropical Rainforest. This region is known for its warm temperatures and high precipitation throughout the year, which creates ideal conditions for dense, diverse forests to thrive. Tropical rainforests are typically found near the equator, where they enjoy a consistently humid environment and receive significant rainfall, sustaining a wide variety of plant and animal life.

In contrast, the Subarctic Zone, while it may have forested areas such as boreal forests, is generally characterized by a colder climate with long winters and short summers, leading to less dense forest coverage compared to tropical rainforests. The Desert Zone is defined by low precipitation and arid conditions, which prevent forest growth, resulting instead in sparse vegetation adapted to dry environments. The Temperate Zone has a mixture of climates, including deciduous and mixed forests, but again does not have the dense, evergreen canopy typical of tropical rainforests. Thus, the defining characteristics of the Tropical Rainforest make it the region most synonymous with extensive forest coverage.