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The disappearance of Steller's sea cow from the Bering and C

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The disappearance of Steller's sea cow from the Bering and C [#permalink] New post 27 Feb 2017, 03:04
Expert's post
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Question Stats:

58% (02:01) correct 41% (02:45) wrong based on 12 sessions


The disappearance of Steller's sea cow from the Bering and Copper islands by 1768 has long been blamed on intensive hunting. But its disappearance took only 28 years from the time Steller first described the species, a remarkably short time for hunting alone to depopulate the islands, especially given the large populations initially reported. However, by 1750, hunters had also targeted nearby sea otter populations. Fewer otters would have allowed sea urchin populations on which the otters preyed to expand and the urchins' grazing pressure on kelp forests to increase. Sea cows were totally dependent on kelp for food, and within a decade of the onset of otter hunting Steller noted that the islands' sea cows appeared malnourished.
Which of the following can be inferred from the passage about kelp forests in the Bering and Copper islands between 1750 and 1768 ?
A) They were reduced significantly.
B) They disappeared entirely from the region.
C) They were the primary food source for sea otters.
D) They were harvested in record numbers by humans.
E) They increased pressure on sea urchin populations.

[Reveal] Spoiler: OA
A


According to the passage, it is likely that during the mid-1700s, sea urchin populations near the Bering and Copper islands
A) were diminished by sea cow predation
B) experienced substantial increases
C) migrated to waters with more plentiful food supplies
D) were reduced by the pressures of hunting
E) appeared to be malnourished

[Reveal] Spoiler: OA
B


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Re: The disappearance of Steller's sea cow from the Bering and C [#permalink] New post 08 Mar 2017, 03:57
Expert's post
Explanation

1)

here the OA is A. Notice how E is tricky if you do not read very carefully. E is the other way around. The reverse.

2)
Quote:
But its disappearance took only 28 years from the time Steller first described the species, a remarkably short time for hunting alone to depopulate the islands, especially given the large populations initially reported.


From the entire sentence and the red part, you clearly might infer that the population experienced substantial increases
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Re: The disappearance of Steller's sea cow from the Bering and C [#permalink] New post 13 Oct 2018, 05:28
1.A
2.B
Re: The disappearance of Steller's sea cow from the Bering and C   [#permalink] 13 Oct 2018, 05:28
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The disappearance of Steller's sea cow from the Bering and C

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