[单项选择] Wetlands What are wetlands Wetlands can be thought of as "biological supermarkets." They provide great volumes of food that attract many animal species. These animals use wetlands for part of or all of their life-cycle. Dead plant leaves and stems break down in the water to form small particles of organic material called "detritus." This enriched material feeds many small aquatic (水生的) insects, shellfish, and small fish that are food for larger predatory (食肉的) fish, reptiles, amphibians (两栖动物) , birds, and mammals. What are the functions and values of wetlands Long regarded as wastelands, wetlands are now recognized as important features in the landscape that provide numerous beneficial services for people and for fish and wildlife. Some of these services, or functions, include water quality improvement, floodwater storage, fish and wildlife habitat, aesthetics, and biological productivity. These beneficial services, considered valuable
A. Y
B. N
C. NG