Which of the following invasive species causes soil erosion, destroys young trees and consumes seeds and nuts necessary for new growth?

The selection of feral hogs as the answer is grounded in their significant impact on ecosystems, particularly in forested areas. Feral hogs are known for their destructive feeding habits, which include rooting up the soil in search of food. This rooting behavior not only destabilizes the soil structure, leading to increased soil erosion, but also severely damages young trees and native vegetation. They can uproot and consume seedlings, saplings, nuts, and seeds, which are essential for forest regeneration and overall ecosystem health.

In contrast, the other invasive species listed have different ecological impacts. Asian carp, for instance, primarily affect aquatic systems and do not significantly impact soil erosion or terrestrial seed consumption. Purple loosestrife is a wetland invader that disrupts local plant communities but is not known for the same kind of habitat destruction associated with young trees. Common carp also mostly influence water bodies by uprooting aquatic plants and altering sediment but do not threaten terrestrial ecosystems directly in the manner that feral hogs do.

Thus, feral hogs are uniquely problematic in the context of soil health and forest regeneration, making them the correct answer to the question.