Meaning: 'Previously' means 'before now' or 'at an earlier time,' indicating that the belief about the harm was held in the past.

Wrong options:

• collectively: 'Collectively' refers to a group acting together, which does not fit the context of individual beliefs about harm.
• individually: 'Individually' implies separate consideration, which does not align with the idea of a prior collective belief.
• pretentiously: 'Pretentiously' means in a way that attempts to impress by affecting greater importance, which is irrelevant to the context of belief.

Correct answer: reveals

Explanation: The verb 'reveals' is appropriate as it indicates that the new study is disclosing information about the harm caused by fish farms. This fits the context of the sentence, which discusses findings from research.

Meaning: 'Reveals' means to make something known or visible that was previously hidden or unknown.

Wrong options:

• introduces: 'Introduces' suggests presenting something for the first time, which does not accurately describe the study's function of disclosing existing information.
• deceives: 'Deceives' implies misleading or tricking, which contradicts the positive connotation of the study's findings.
• conceives: 'Conceives' means to form or devise a plan or idea, which does not fit the context of revealing information.

Correct answer: recover

Explanation: The verb 'recover' fits grammatically and contextually as it indicates that marine ecosystems can return to a healthy state after damage. This aligns with the overall message of resilience in the face of environmental impact.

Meaning: 'Recover' means to return to a normal state after a period of difficulty or damage.

Wrong options:

• derive: 'Derive' means to obtain something from a source, which does not fit the context of ecosystems returning to health.
• segrigate: 'Segrigate' is a misspelling of 'segregate,' which means to separate, and does not apply to the context of recovery.
• prevent: 'Prevent' means to stop something from happening, which contradicts the idea of ecosystems healing after damage.

Correct answer: surprisingly

Explanation: The adverb 'surprisingly' fits well as it indicates that the speed of recovery is unexpected, which adds nuance to the statement about marine ecosystems. This aligns with the context of the sentence, emphasizing an unexpected finding.

Meaning: 'Surprisingly' means in a way that causes surprise or is unexpected, highlighting the rapid recovery of ecosystems.

Wrong options:

• visually: 'Visually' pertains to sight, which does not relate to the context of recovery speed.
• commonly: 'Commonly' suggests something usual or frequent, which does not apply to the unexpected nature of the recovery.
• spiritually: 'Spiritually' relates to the spirit or soul, which is irrelevant to the context of ecological recovery.

Correct answer: placed

Explanation: The verb 'placed' fits grammatically and contextually as it indicates that the facilities need to be positioned with care. This aligns with the sentence's focus on the careful management of fish farms.

Meaning: 'Placed' means to put something in a particular position, emphasizing the need for careful location of fish farms.

Wrong options:

• dislocated: 'Dislocated' means to move something from its proper place, which contradicts the need for careful placement.
• estimated: 'Estimated' means to roughly calculate or judge, which does not fit the context of physical placement.
• dismounted: 'Dismounted' means to get off or away from something, which is irrelevant to the context of positioning fish farms.

Correct answer: Badly

Explanation: The adverb 'badly' fits grammatically and contextually as it describes the negative impact of fish farms on the ecosystem. This aligns with the overall tone of caution regarding environmental effects.

Meaning: 'Badly' means in a way that is harmful or undesirable, indicating the serious effects of mismanaged farms.

Wrong options:

• Well: 'Well' implies a positive outcome, which contradicts the negative context of the effects on the ecosystem.
• Expectedly: 'Expectedly' suggests something anticipated, which does not align with the serious nature of the effects described.
• Attentively: 'Attentively' means with careful attention, which does not fit the context of the negative impact.