Because cryptophytes and other microphytobenthos (MPB)—microscopic organisms inhabiting tidal flats—are consumed by clams as well as by certain shorebirds and fish, MPB are __________ estuary ecosystems. Decreased MPB abundance, which may be caused by environmental stressors, thus has a direct, negative impact on coastal food webs.
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Verbal·Craft and Structure·Words in Context
easyWhich choice completes the text with the most logical and precise word or phrase?
A
imperative for
B
interchangeable with
C
emblematic of
D
subordinate to