A distinctive habitat at the boundary between surface water and groundwater in river corridors, a river’s hyporheic zone (HZ) can extend well beyond its banks: for a major river like the Mississippi, the HZ may reach as far as 300 meters from the main channel. Because it is difficult to access directly, scientists use to assess the HZ—for example, by tracking aquatic organisms found in soil past a river’s banks.
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Verbal·Craft and Structure·Words in Context
hardWhich choice completes the text with the most logical and precise word or phrase?
A
parameters
B
proxies
C
simulations
D
auxiliaries