What is the primary role of wetlands in the ecosystem?

Wetlands play a vital role in ecosystems due to their multifaceted functions. They serve as critical habitats for a diverse range of plant and animal species, contributing significantly to biodiversity. Wetlands act as natural water filters, removing pollutants and sediments from water, which enhances water quality in adjacent environments. Additionally, they provide flood protection by absorbing excess rainwater and holding it temporarily, thereby mitigating the impact of flooding in surrounding areas.

While other answers mention recreational opportunities, agricultural land, and specific habitats for birds, these aspects do not capture the comprehensive ecological functions that wetlands serve. The diverse ecosystem services that wetlands offer underscore their importance in maintaining environmental health and stability, making option B the most accurate representation of their primary role.