Sea otters are a small mammal that lives in the waters along North America's west coast from California to Alaska. A few years ago some of the sea otter populations off of the Alaskan coast started to decline rapidly and raised several concerns because of their important role in the coastal ecosystem. Experts began investigating and came up with two possible explanations. One explanation was environmental pollution and the second was attacks by predators.
At first it seemed as if the pollution was the most likely cause for the population decline. One reason pollution was more likely was because of the known pollution sources along the Alaskan coast such as oil rigs. Also water samples taken in the area showed increased levels of chemicals that could decrease the otters' immune systems and indirectly result in their deaths.
Another thing that pointed to pollution as the culprit was the decline of other sea mammals such as seals in the same areas. This indicated that whatever was affecting the otters was also affecting the other sea mammals. Environmental pollution usually affects an entire ecosystem instead of just one species. Only predators that occurred in a large area, such as orcas (a large predatory whale), could cause the same effect, but they usually hunt larger prey.
Finally, scientists believed the pollution hypothesis would also explain the uneven pattern of otter decline. In some Alaskan locations the otter population declined greatly while other populations remained stable. Some experts suggested this could be explained by ocean currents, or other environmental factor, might have created uneven concentrations of pollutants along the coast.
The reading passage states that the reasons for Sea otters decline is attributed to two reasons. First, environmental pollution, second, predators. However, the reading passage pointes out environmental pollution is the most reason for decline not the predators, based on the investigation found large quantities of chemicals in the sea water such as oil rigs. Moreover, because there is uneven in the Sea otter population, the author states a significant indication that the pollution is the major reason for the decline.
However, the speaker states that the major factor for Sea otters decline is predation not pollution as the writer mentioned. The speaker pointes out that there are only a few number if dead otter found, and if the pollution is the key, why does a few number of died otters there? However, this could be resulted from predators ate the otters; thus, no more died otters are there.
The author excludes that predators such as whales are the reasons for uneven decline in the Sea otters, because the only predators who can hunt such a large quantities is whale. However, it usually tents to hunt preys which are bigger. On the other hand, the speaker states that whales such as orcas is the predators who hunting the Sea otters. In addition, based on the evidence that there a stability in the sea otters where there is a few number of orcas and can't access to them.
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Grammar and spelling errors:
Line 3, column 248, Rule ID: MANY_NN[1]
Message: Possible agreement error. The noun number seems to be countable; consider using: 'few numbers'.
Suggestion: few numbers
...if the pollution is the key, why does a few number of died otters there? However, this cou...
^^^^^^^^^^
Line 5, column 158, Rule ID: A_PLURAL[2]
Message: Don't use indefinite articles with plural words. Did you mean 'quantity'?
Suggestion: quantity
...nly predators who can hunt such a large quantities is whale. However, it usually tents to ...
^^^^^^^^^^
Line 5, column 172, Rule ID: BEEN_PART_AGREEMENT[1]
Message: Consider using a past participle here: 'whaled'.
Suggestion: whaled
...who can hunt such a large quantities is whale. However, it usually tents to hunt prey...
^^^^^
Line 5, column 439, Rule ID: MANY_NN[1]
Message: Possible agreement error. The noun number seems to be countable; consider using: 'few numbers'.
Suggestion: few numbers
...lity in the sea otters where there is a few number of orcas and cant access to them.
^^^^^^^^^^
Line 5, column 463, Rule ID: CANT[1]
Message: Did you mean 'can't' or 'cannot'?
Suggestion: can't; cannot
...here there is a few number of orcas and cant access to them.
^^^^
Transition Words or Phrases used:
but, first, however, if, moreover, second, so, thus, in addition, such as, on the other hand
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 14.0 10.4613686534 134% => OK
Auxiliary verbs: 2.0 5.04856512141 40% => OK
Conjunction : 2.0 7.30242825607 27% => More conjunction wanted.
Relative clauses : 11.0 12.0772626932 91% => OK
Pronoun: 10.0 22.412803532 45% => OK
Preposition: 17.0 30.3222958057 56% => More preposition wanted.
Nominalization: 11.0 5.01324503311 219% => Less nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1157.0 1373.03311258 84% => OK
No of words: 237.0 270.72406181 88% => More content wanted.
Chars per words: 4.88185654008 5.08290768461 96% => OK
Fourth root words length: 3.92362132708 4.04702891845 97% => OK
Word Length SD: 2.53626161448 2.5805825403 98% => OK
Unique words: 109.0 145.348785872 75% => More unique words wanted.
Unique words percentage: 0.459915611814 0.540411800872 85% => More unique words wanted or less content wanted.
syllable_count: 363.6 419.366225166 87% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 2.0 3.25607064018 61% => OK
Article: 7.0 8.23620309051 85% => OK
Subordination: 2.0 1.25165562914 160% => OK
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 2.0 2.5761589404 78% => OK
Performance on sentences:
How many sentences: 11.0 13.0662251656 84% => Need more sentences. Double check the format of sentences, make sure there is a space between two sentences, or have enough periods. And also check the lengths of sentences, maybe they are too long.
Sentence length: 21.0 21.2450331126 99% => OK
Sentence length SD: 47.2998174127 49.2860985944 96% => OK
Chars per sentence: 105.181818182 110.228320801 95% => OK
Words per sentence: 21.5454545455 21.698381199 99% => OK
Discourse Markers: 8.36363636364 7.06452816374 118% => OK
Paragraphs: 3.0 4.09492273731 73% => More paragraphs wanted.
Language errors: 5.0 4.19205298013 119% => OK
Sentences with positive sentiment : 3.0 4.33554083885 69% => OK
Sentences with negative sentiment : 2.0 4.45695364238 45% => More negative sentences wanted.
Sentences with neutral sentiment: 6.0 4.27373068433 140% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.189141210534 0.272083759551 70% => OK
Sentence topic coherence: 0.0824820561841 0.0996497079465 83% => OK
Sentence topic coherence SD: 0.0488246892069 0.0662205650399 74% => OK
Paragraph topic coherence: 0.138221209838 0.162205337803 85% => OK
Paragraph topic coherence SD: 0.0223392803261 0.0443174109184 50% => OK
Essay readability:
automated_readability_index: 12.3 13.3589403974 92% => Automated_readability_index is low.
flesch_reading_ease: 58.62 53.8541721854 109% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 10.3 11.0289183223 93% => OK
coleman_liau_index: 11.02 12.2367328918 90% => OK
dale_chall_readability_score: 7.74 8.42419426049 92% => OK
difficult_words: 46.0 63.6247240618 72% => More difficult words wanted.
linsear_write_formula: 11.5 10.7273730684 107% => OK
gunning_fog: 10.4 10.498013245 99% => OK
text_standard: 12.0 11.2008830022 107% => OK
What are above readability scores?
---------------------
Minimum four paragraphs wanted. The correct pattern:
para 1: introduction
para 2: doubt 1
para 3: doubt 2
para 4: doubt 3
Less contents wanted from the reading passages(25%), more content wanted from the lecture (75%).
Don't need a conclusion paragraph.
Read sample essays from ETS:
http://www.testbig.com/users/toeflwritingmaster
Rates: 70.0 out of 100
Scores by essay e-grader: 21.0 Out of 30
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Note: the e-grader does NOT examine the meaning of words and ideas. VIP users will receive further evaluations by advanced module of e-grader and human graders.