The sea otter is a small mammal that lives in waters along the western coast of North America from California to Alaska. When some sea otter populations off the Alaskan coast started rapidly declining a few years ago, it caused much concern because sea otters play an important ecological role in the coastal ecosystem. Experts started investigating the cause of the decline and quickly realized that there were two possible explanations: environmental pollution or attacks by predators. Initially, the pollution hypothesis seemed the more likely of the two.
The first reason why pollution seemed the more likely cause was that there were known sources of it along the Alaskan coast, such as oil rigs and other sources of industrial chemical pollution. Water samples from the area revealed increased levels of chemicals that could decrease the otters' resistance to life-threatening infections and thus could indirectly cause their deaths.
Second, other sea mammals such as seals and sea lions along the Alaskan coast were also declining, indicating that whatever had endangered the otters was affecting other sea mammals as well. This fact again pointed to environmental pollution, since it usually affects the entire ecosystem rather than a single species. Only widely occurring predators, such as the orca (a large predatory whale), could have the same effect, but orcas prefer to hunt much larger prey, such as other whales.
Third, scientists believed that the pollution hypothesis could also explain the uneven pattern of otter decline: at some Alaskan locations the otter populations declined greatly, while at others they remained stable. Some experts explained these observations by suggesting that ocean currents or other environmental factors may have created uneven concentrations of pollutants along the coast.
The reading passage and the lecturer talking about the most probably reason lead to decline the number of otters in Alaska’s coast. The reading agree it's the environmental pollution rather than attacking by predators. But the professor cast a doubt about this argument because of many reasons.
First of all, the writer asserts that rising in the level of industrial chemical pollution along Alaska coast considered an important reason which impact otter’s life by getting infections. For instance, chemical like oil rigs is one of the risky materials inside the seas. But the narrator believes that the predators are considered the otter’s life-threading. He allocates numerous information which explained that there are no dead otters at Alaska coast.
Secondly, allegation of script poses that the pollution also affects other mammals, for example, seas lion, seals, and orcas. Moreover, orcas prefer hunting the larger prey like whales. The aerator insists that the whales diminish in number because it hunted by humans. Furthermore, orcas should change their diet habit for living.
Additionally, the essay suggests that the uneven pattern of otters also reduced due to pollution. Although the writer explained that uneven pattern could be related to the coast's current or other kind of environmental issue. The lecturer opposed this concept by clarifying that the uneven pattern because the predators couldn't reach the otters in shallow and rocky areas.
Grammar and spelling errors:
Line 1, column 156, Rule ID: IT_IS[17]
Message: Did you mean 'it's' (='it is') instead of 'its' (possessive pronoun)?
Suggestion: it's; it is
... Alaska's coast. The reading agree its the environmental pollution rather than...
^^^
Line 4, column 319, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: couldn't
...he uneven pattern because the predators couldnt reach the otters in shallow and rocky a...
^^^^^^^
Transition Words or Phrases used:
also, but, first, furthermore, if, moreover, second, secondly, so, for example, for instance, kind of, talking about, first of all
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 4.0 10.4613686534 38% => More to be verbs wanted.
Auxiliary verbs: 2.0 5.04856512141 40% => OK
Conjunction : 6.0 7.30242825607 82% => OK
Relative clauses : 10.0 12.0772626932 83% => OK
Pronoun: 14.0 22.412803532 62% => OK
Preposition: 26.0 30.3222958057 86% => OK
Nominalization: 8.0 5.01324503311 160% => OK
Performance on vocabulary words:
No of characters: 1253.0 1373.03311258 91% => OK
No of words: 227.0 270.72406181 84% => More content wanted.
Chars per words: 5.51982378855 5.08290768461 109% => OK
Fourth root words length: 3.88156143495 4.04702891845 96% => OK
Word Length SD: 2.70315204757 2.5805825403 105% => OK
Unique words: 143.0 145.348785872 98% => OK
Unique words percentage: 0.629955947137 0.540411800872 117% => OK
syllable_count: 382.5 419.366225166 91% => OK
avg_syllables_per_word: 1.7 1.55342163355 109% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 1.0 3.25607064018 31% => OK
Article: 6.0 8.23620309051 73% => OK
Subordination: 1.0 1.25165562914 80% => OK
Conjunction: 3.0 1.51434878587 198% => OK
Preposition: 0.0 2.5761589404 0% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 14.0 13.0662251656 107% => OK
Sentence length: 16.0 21.2450331126 75% => The Avg. Sentence Length is relatively short.
Sentence length SD: 35.8844517521 49.2860985944 73% => OK
Chars per sentence: 89.5 110.228320801 81% => OK
Words per sentence: 16.2142857143 21.698381199 75% => OK
Discourse Markers: 9.28571428571 7.06452816374 131% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 2.0 4.19205298013 48% => OK
Sentences with positive sentiment : 5.0 4.33554083885 115% => OK
Sentences with negative sentiment : 4.0 4.45695364238 90% => OK
Sentences with neutral sentiment: 5.0 4.27373068433 117% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.170485984365 0.272083759551 63% => OK
Sentence topic coherence: 0.0496849546362 0.0996497079465 50% => OK
Sentence topic coherence SD: 0.0441491668186 0.0662205650399 67% => OK
Paragraph topic coherence: 0.0888856901784 0.162205337803 55% => OK
Paragraph topic coherence SD: 0.0297149493431 0.0443174109184 67% => OK
Essay readability:
automated_readability_index: 12.7 13.3589403974 95% => OK
flesch_reading_ease: 46.78 53.8541721854 87% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 10.7 11.0289183223 97% => OK
coleman_liau_index: 14.44 12.2367328918 118% => OK
dale_chall_readability_score: 9.3 8.42419426049 110% => OK
difficult_words: 70.0 63.6247240618 110% => OK
linsear_write_formula: 8.5 10.7273730684 79% => OK
gunning_fog: 8.4 10.498013245 80% => OK
text_standard: 9.0 11.2008830022 80% => OK
What are above readability scores?
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Rates: 88.3333333333 out of 100
Scores by essay e-grader: 26.5 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.