Question

wetland biomes
are dominated by ________ and poorly draining soils
include:
bogs
wetland which accumulates dead plant material
fens
wetland with grasses and mineral rich water
marshes
wetland dominated by ________
swamps
wetland dominated by trees

Explanation:

For the first blank in "Wetland Biomes Are dominated by ____ and poorly draining soils", wetland biomes are typically dominated by water (or aquatic vegetation, but the context here likely expects "water" as a key component since wetlands have standing water or saturated conditions). For the "marshes" description "wetland dominated by ____", marshes are wetlands dominated by herbaceous plants (grasses, rushes, etc.). And swamps are dominated by trees, as given. So the first blank should be "water" (or "aquatic vegetation", but more accurately, the dominant feature with poorly draining soils is water - saturated conditions, so "water" or "aquatic plants" but the most common fill - in for the first part is "water" or "hydrophytes" (aquatic plants). For marshes, they are dominated by "grasses" (or herbaceous plants).

Answer:

First blank: water (or aquatic plants)
Marshes blank: grasses (or herbaceous plants)
Swamps: as given, dominated by trees.