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 sea otter is a small mammal that lives in waters along the western coast of north America from california to Alaska. water polution is one hypothesis that couses some sea otter population off the alaskan coast started rapidly declining a few years ago. the first reason for water polution is oil rigs and other source of industrial sources of it along the alaskan coast. second hypothesis is hunting by human. when other sea mammals such as seals and sea lion along the alaskan coast were also declining, indicating that whatever had endangered the otters was affecting other sea mammals as well. third, the alaskan location is important in declining sea otter and scientists also believe the polution hypothesis could explain the uneven pattern of otter decline at same alaskan location the otter population declined greatly while at others they remained stable.
Grammar and spelling errors:
Line 1, column 1, Rule ID: UPPERCASE_SENTENCE_START
Message: This sentence does not start with an uppercase letter
Suggestion: The
the sea otter is a small mammal that lives ...
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Suggestion: Water
...orth America from california to Alaska. water polution is one hypothesis that couses ...
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Suggestion: The
...rted rapidly declining a few years ago. the first reason for water polution is oil ...
^^^
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Suggestion: Second
... sources of it along the alaskan coast. second hypothesis is hunting by human. when ot...
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Suggestion: When
... second hypothesis is hunting by human. when other sea mammals such as seals and sea...
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Suggestion: Third
...as affecting other sea mammals as well. third, the alaskan location is important in d...
^^^^^
Transition Words or Phrases used:
also, first, if, second, so, third, well, while, such as
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 7.0 10.4613686534 67% => OK
Auxiliary verbs: 1.0 5.04856512141 20% => OK
Conjunction : 3.0 7.30242825607 41% => More conjunction wanted.
Relative clauses : 4.0 12.0772626932 33% => More relative clauses wanted.
Pronoun: 5.0 22.412803532 22% => OK
Preposition: 15.0 30.3222958057 49% => More preposition wanted.
Nominalization: 7.0 5.01324503311 140% => OK
Performance on vocabulary words:
No of characters: 732.0 1373.03311258 53% => More number of characters wanted.
No of words: 142.0 270.72406181 52% => More content wanted.
Chars per words: 5.15492957746 5.08290768461 101% => OK
Fourth root words length: 3.45201032557 4.04702891845 85% => OK
Word Length SD: 2.4004066309 2.5805825403 93% => OK
Unique words: 88.0 145.348785872 61% => More unique words wanted.
Unique words percentage: 0.619718309859 0.540411800872 115% => OK
syllable_count: 233.1 419.366225166 56% => syllable counts are too short.
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 0.0 3.25607064018 0% => OK
Article: 3.0 8.23620309051 36% => OK
Subordination: 1.0 1.25165562914 80% => OK
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 0.0 2.5761589404 0% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 6.0 13.0662251656 46% => 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: 23.0 21.2450331126 108% => OK
Sentence length SD: 69.8442712198 49.2860985944 142% => OK
Chars per sentence: 122.0 110.228320801 111% => OK
Words per sentence: 23.6666666667 21.698381199 109% => OK
Discourse Markers: 9.33333333333 7.06452816374 132% => OK
Paragraphs: 1.0 4.09492273731 24% => More paragraphs wanted.
Language errors: 6.0 4.19205298013 143% => OK
Sentences with positive sentiment : 2.0 4.33554083885 46% => More positive sentences wanted.
Sentences with negative sentiment : 0.0 4.45695364238 0% => More negative sentences wanted.
Sentences with neutral sentiment: 4.0 4.27373068433 94% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.567521759999 0.272083759551 209% => OK
Sentence topic coherence: 0.289927958359 0.0996497079465 291% => Sentence topic similarity is high.
Sentence topic coherence SD: 0.215948702041 0.0662205650399 326% => The coherence between sentences is low.
Paragraph topic coherence: 0.567521759999 0.162205337803 350% => Maybe some contents are duplicated.
Paragraph topic coherence SD: 0.0 0.0443174109184 0% => Paragraphs are similar to each other. Some content may get duplicated or it is not exactly right on the topic.
Essay readability:
automated_readability_index: 14.7 13.3589403974 110% => OK
flesch_reading_ease: 48.13 53.8541721854 89% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 12.3 11.0289183223 112% => OK
coleman_liau_index: 12.89 12.2367328918 105% => OK
dale_chall_readability_score: 8.56 8.42419426049 102% => OK
difficult_words: 34.0 63.6247240618 53% => More difficult words wanted.
linsear_write_formula: 11.5 10.7273730684 107% => OK
gunning_fog: 11.2 10.498013245 107% => OK
text_standard: 12.0 11.2008830022 107% => OK
What are above readability scores?
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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
More content wanted.
Minimum 150 words wanted.
Rates: 40.0 out of 100
Scores by essay e-grader: 12.0 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.