The passage describes the gradual enhancement of life on the island, particularly benefiting birds like Antarctic prions and white-headed petrels. It emphasizes the increasing population of these birds as pest control measures are implemented on the island. With pests under control, the birds can return, breed, and contribute positively to the ecosystem. Additionally, the passage notes how bird droppings enrich the soil with nutrients, promoting plant growth.
Overall, Option D effectively encapsulates the central theme of the passage: the rejuvenation and enhancement of island life due to pest eradication and its positive effects on birds and plants.
Option A erroneously suggests a rise in predatory bird numbers, contradicting the positive developments outlined in the passage.
Option B is inaccurate as the passage does not explicitly attribute the positive changes solely to this protection measure.
Option C is more general and does not specifically highlight the absence of pests as a critical factor in the positive transformation described in the passage.
So, the correct option is (D): In the absence of pests, life on the island is now protected, and there has been a revival of a variety of birds and plants.
The passage given below is followed by four summaries. Choose the option that best captures the essence of the passage.
In investigating memory-beliefs, there are certain points which must be borne in mind. In the first place, everything constituting a memory-belief is happening now, not in that past time to which the belief is said to refer. It is not logically necessary to the existence of a memory-belief that the event remembered should have occurred, or even that the past should have existed at all. There is no logical impossibility in the hypothesis that the world sprang into being five minutes ago, exactly as it then was, with a population that "remembered" a wholly unreal past. There is no logically necessary connection between events at different times; therefore nothing that is happening now or will happen in the future can disprove the hypothesis that the world began five minutes ago. Hence the occurrences which are CALLED knowledge of the past are logically independent of the past; they are wholly analysable into present contents, which might, theoretically, be just what they are even if no past had existed.
For any natural number $k$, let $a_k = 3^k$. The smallest natural number $m$ for which \[ (a_1)^1 \times (a_2)^2 \times \dots \times (a_{20})^{20} \;<\; a_{21} \times a_{22} \times \dots \times a_{20+m} \] is: