Meaning: 'Fell' means to decrease or drop down, indicating that the sea levels went lower, allowing the birds to recolonize the island.

Wrong options:

• rose: The word 'rose' is the past tense of 'rise,' which indicates an increase in sea levels, contradicting the context of recolonization after a previous extinction.
• steadied: 'Steadied' implies that the sea levels remained constant, which does not provide the necessary change for recolonization to occur.
• changed: While 'changed' suggests a transformation, it is too vague and does not specify the direction of the change, making it unsuitable for the context.

Correct answer: accessible

Explanation: The word 'accessible' describes the food on the island as being easy to reach or obtain, which is crucial for the birds' survival and aligns with the context of their evolution to flightlessness. It fits grammatically as an adjective modifying 'food.'

Meaning: 'Accessible' means that something is easy to approach or use, indicating that the food was readily available for the birds.

Wrong options:

• inaccessible: 'Inaccessible' means not able to be reached, which contradicts the idea that the birds thrived due to available food.
• moist: 'Moist' refers to the level of wetness and does not relate to the availability of food, making it contextually irrelevant.
• reserve: 'Reserve' refers to a supply or stock, which does not fit grammatically or contextually as it does not describe the nature of the food.

Correct answer: wiped

Explanation: The word 'wiped' indicates a complete removal or destruction, which is appropriate in the context of a catastrophic flood that eliminated the birds. It fits grammatically as the past tense verb aligns with the narrative of the sentence.

Meaning: 'Wiped' means to completely remove or destroy, suggesting that the flood eradicated the birds from the island.

Wrong options:

• spread: 'Spread' implies distribution rather than destruction, which does not fit the context of the flood's impact on the birds.
• helped: 'Helped' suggests assistance, which is contrary to the destructive nature of a flood, making it contextually inappropriate.
• turned: 'Turned' is vague and does not convey the idea of destruction, making it unsuitable for the context.

Correct answer: identical

Explanation: The word 'identical' indicates that the species evolved to be very similar or the same, which is essential to the concept of iterative evolution. It fits grammatically as an adjective describing 'species.'

Meaning: 'Identical' means exactly the same, highlighting that the species evolved from the same ancestor in a similar manner.

Wrong options:

• wild: 'Wild' refers to organisms living in their natural state, which does not relate to the concept of evolution from a common ancestor.
• biological: 'Biological' pertains to living organisms but does not specifically convey the idea of similarity in evolution, making it less precise.
• distinct: 'Distinct' means different or separate, which contradicts the idea of species evolving from the same ancestor, making it contextually incorrect.