Final answer:
The statement that wetlands have become endangered in Pennsylvania over the past two hundred years is true. Wetland loss affects both biotic and abiotic components of ecosystems and is caused by various factors including invasive species and climate change. Restorative efforts are necessary to recover these crucial habitats.
Step-by-step explanation:
Over the past two hundred years, wetlands have indeed become endangered in Pennsylvania as well as in other parts of the world. This statement is true. Wetlands provide essential services to both the biotic (living) and abiotic (non-living) elements of ecosystems by offering rich habitats and acting as natural filters for pollutants. Factors like siltation, invasive species, and climate change contribute greatly to the degradation and loss of these vital ecosystems. The destruction of wetlands not only occurs in developed countries like those in Europe but is also a significant issue in developing nations, particularly with the acceleration of coastal zone development. To mitigate and reverse the damage, comprehensive wetland restoration efforts are often needed. Such efforts may include addressing the causes of wetland destruction—whether it's siltation, changes in water flow due to invasive species, or larger scale irrigation and drainage projects that can profoundly affect these habitats.