Question

emergent wetlands
percent of earth covered in water
high primary productivity rate in wetlands
means it is referred to as this
dominant plants in this wetland are plants
rooted in soil but emerging from the water
(grasses)
refers to wetlands because they absorb runoff
and slowly release it back into the
environment

Explanation:

The problem is about emergent wetlands, which involves the study of wetland ecosystems, plant types in wetlands, and their ecological functions. This falls under Environmental Sciences (a subfield of Natural Science) as it deals with environmental ecosystems, plant - water - soil interactions, and wetland ecology.

Answer:

The subfield is Environmental Sciences (under Natural Science).