Which of the following forest ecosystems is characterized by longleaf pines?

The Sandhill's Longleaf Pine Forests are indeed characterized by longleaf pines, an iconic species that thrives in well-drained sandy soils commonly found in the Sandhills region of North Carolina. This ecosystem is adapted to fire, which plays a crucial role in maintaining the health and biodiversity of longleaf pine forests by controlling the growth of competing vegetation and promoting the growth of certain understory plants that are fire-tolerant.

The longleaf pine itself is a keystone species, providing habitat for a variety of wildlife, including the endangered red-cockaded woodpecker. These forests typically feature a diverse understory of grasses and flowering plants that contribute to their ecological value. The longleaf pine ecosystem represents one of the few remnants of the once extensive longleaf pine forest system that covered much of the southeastern United States prior to widespread logging and land conversion.

In contrast, the other forest ecosystems mentioned do not specialize in longleaf pines. Mountain Ridge Forests primarily consist of hardwood species and are characterized by their elevation and cooler temperatures. Piedmont Hardwood Forests are mainly composed of diverse hardwood species such as oaks and hickories, reflecting the fertile, often clayey soils of the region. Coastal Marsh Forests are associated with wetlands