A unique habitat at the interface of surface water and groundwater within river corridors, a river’s hyporheic zone (HZ) extends beyond its embankments: for a great river like the Brahmaputra, the HZ might reach up to 400 meters from the channel. Because of its inaccessibility, scientists use __________ to measure the HZ—for example, by mapping aquatic organisms found in soil beyond a waterway’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
simulations
B
proxies
C
auxiliaries
D
parameters