Preserving ecosystems can improve water quality, limit flood damages, and recharge the groundwater in a watershed.
a. agricultural
b. wetland
c. desert
d. forest

D. forest

Explanation:

Forests play a vital role in soil health and water quality. Not only do they act as anchors for the loose soil, they are also living filtering mechanisms. Without trees, during heavy rainfall, the amount of water will exceed the soil's capacity to absorb it. Thus, this excess will run off collecting not only soil particles (which leads to soil erosion), but also chemicals and pollutants. All this will end up in streams and rivers and thus affect aquatic ecosystems and water quality. These water sources will in turn cause floods that can inflict heavy damages.

A forest canopy will limit the amount of water that reaches the soil. Furthermore, large amounts of water are absorbed by trees on a daily basis. With this water, any pollutants or excess nutrients due to human activity are absorbed and stored inside the trees. Thus, trees play a vital role for the natural circulation and filtration of water.

B

Explanation:

Just did it and got it wrong :')

Btw here is the explanation for reals: A watershed is the land that water flows across or through on its way to a stream, lake, wetland, or other body of water. A wetland is an area that is permanently or periodically flooded with water and contains organisms that have adapted to these conditions.

Wetland ecosystems can benefit a watershed by improving water quality by removing pollution and retaining excess nutrients. Wetland ecosystems can also reduce floods by holding water during the rainy season and releasing it at drier times. Water seeps out of wetlands and recharges the watershed's groundwater.

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