The Egyptian plover–a bird native to Africa–has a symbiotic relationship with the Nile crocodile. While a crocodile rests on land with its mouth open for extended periods of time, the plover eats the food that is stuck in the crocodile’s teeth. This __________ relationship provides a nutritious meal for the bird and removes potentially dangerous bacteria from the crocodile’s mouth.
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Verbal·Craft and Structure·Words in Context
mediumWhich choice completes the text with the most logical and precise word or phrase?
A
inefficient
B
reciprocal
C
interchangeable
D
unequal