Which of the following is NOT a typical characteristic of marshes?

Marshes are unique ecosystems that are typically characterized by specific features. One defining characteristic is the presence of soft-stemmed vegetation, which is commonly found in marshes due to the saturated soil conditions. This type of vegetation, including grasses, sedges, and reeds, is well-adapted to the wet, nutrient-rich environments.

Frequent inundation with water is also a hallmark of marshes. These areas are usually periodically flooded, which creates the aquatic conditions that support the soft-stemmed plant species that thrive there.

Rich mineral soil is another typical characteristic, as marshes often have an accumulation of nutrients that contribute to the fertile ground, supporting diverse plant life.

However, high tree density is not a typical characteristic of marshes. Instead, marshes are usually open and lacking in substantial tree cover. Areas that have significant tree density are more accurately classified as swamps, which differ from marshes by having woody plants and more variety in tree species. Therefore, understanding the unique flora and environmental conditions associated with marshes helps clarify why high tree density does not apply to these ecosystems.