Marine biologist Ada Okonkwo noticed that the reef fish she studied did not scatter randomly when a predator appeared. Instead, they moved together in a tight, coordinated group, turning at the same moment as if following a shared signal. Their response was strikingly ______, with hundreds of individuals acting as one.
Which choice completes the text with the most logical and precise word?
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This is "Predict before you peek" at work. Cover the choices and let the clue "acting as one" hand you the idea first: they moved together. The closest match is "unified," and any word about slowness or hesitation clashes with the sentence.
The text says the fish moved together, turned at the same moment, and acted as one, so the blank needs a word meaning coordinated or joined together. "Unified" fits exactly. "Delayed" and "reluctant" describe slowness or unwillingness, which the passage never suggests. "Accidental" contradicts the deliberate, shared signal the fish appear to follow.
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