TOEFL exam

writing skill

TOEFL exam

writing skill

آخرین مطالب
  • ۹۸/۰۱/۱۵
    یک
  • ۰
  • ۰

TPO-10

In the reading section, the writer clarify there exist two hypothesis regarding to the sea otter declination along the western coast of North America to Alaska; environmental pollution and predators attacks. the author contends that water contamination play a key role on the sea otters declining based on some evidence including high level of chemical pollution on water samples, declination of other sea mammals species, and uneven pattern of otter decline; however, in the lecture, the professor casts doubts on the reading points by presenting some reasons and examples.

First of all, the writer claims that investigations on water samples reveal change in water composite due to industrial chemical pollution. Scientists assume aforementioned consideration affects sea otter population by decreasing life-threatening resistance of the otters; in contrast, the professor rejects this notion by stating that if the hypothesis is correct, a lot of otters corps should wash up on the shores owing to killing effect of polluted water while no died otters have found. Therefore, it seemed more likely to an intense generation in one species change the ecosystem. Thus, otters have been eaten as large creatures food.

Moreover, contrary to the idea in the reading suggesting other sea mammals declining would be an acceptable clue supports water pollution danger to coastal life due to the fact that the entire ecosystem is contaminated, the lecturer asserts owing to human hunters beside the shore the Orca diets have been changed; even though, the Orca prefer large prey, their food is limited to small mammals such as seals and sea lines. the lecturer points to the fact the writer mention which similar condition could occur by the Orca too.

In addition, even though the writer indicates that inconsistency of  otter decline's pattern is the result of uneven concentration of contamination due to currents or other environmental factors, the professor relates this to accessibility of orcas to different part of shore based on some examples. For instance, in shallow and rocky locations there is an stabiliy on otter populations in order to the orcas are mammoth whale could not reach those.

  • ۹۸/۰۱/۲۶
  • صحرا می

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