Final answer:
Wetlands in Pennsylvania have become endangered due to habitat destruction caused by human actions. Wetlands provide rich habitats and act as a filter for pollution, but over 80% of all wetlands in certain US regions were destroyed by the 1980s.
Step-by-step explanation:
Wetlands in Pennsylvania have become endangered over the past two hundred years. Wetlands provide rich habitats and act as a filter for pollution, but they have been greatly affected by habitat destruction caused by human actions such as land clearing for agriculture and development. For example, in the US, over 80% of all wetlands in certain regions were destroyed by the 1980s. This loss of wetlands has had a significant impact on both the biotic and abiotic parts of ecosystems.