Which conditions describe fens best?

Fens are a specific type of wetland characterized by generally high water tables and specific types of vegetation which are often dominated by herbaceous plants and grasses. The correct description emphasizes their ability to support marsh-like vegetation, which thrives in nutrient-rich, water-saturated conditions.

Fens typically accumulate peat, which consists of partially decomposed plant material, but they also have a notable presence of sediment. This allows for diverse plant growth, including various wetland species that require saturated soils but may not thrive in more acidic conditions found in bogs.

Understanding the ecological context of fens helps highlight this correct answer. Fens are often locations where groundwater influences the hydrology, leading to slightly alkaline conditions, making them different from other wetland types. This unique combination of water source, soil characteristics, and vegetation allows fens to sustain a diverse array of plant life, distinguishing them from other types of wetlands and underscoring why marsh-like vegetation is characteristic of such environments.