Which of the following describes what happened to wetlands after agricultural expansion? A: They were drained for irrigation.
B: They became polluted from mining.
C: They were converted to swampland.
D: They were used for railroad pathways.

Certain agricultural crops thrive in the moist, rich wetland soils, while wetlands near agricultural lands receive nutrient inputs to maintain an ecosystem balance. More importantly, this relationship shows the intricate balance between viable food and fiber production and preser- vation of natural resources.

Explanation:

geologic time scale (for gradpoint) =)

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