In the set of the materials, the article states that sea cow become extinct in 1768 and although there aren't clear reason for their extinction, there are some theories about that. However, the professor, in the lecture, explains that no one knows the main reason of sea cows extinction and refutes each of the author's reasons.
First, the reading claims that overhunting could be a good reason for sea cows because they considered a good food in a harsh environment where the native Siberian lived. However, the professor argues that this marine mammal was massive creatures and had an enormous body. In addition, he states that the population of native people wasn't so many. Therefore, they didn't to hunt and kill a lot of them.
Second, the reading passage says that due to the ecosystems interruptions, the kelp that considers the main source of food for sea cows might decline significantly. The professor counters this point by stating that if the number of kelp decrease as a result of changing in ecosystems, it must have some effect on other mammals like whales. Furthermore, the professor mentions that there didn't have any report on whale decline on that period of time. Hence, ecosystems disturbances couldn't be the reason for extinction.
Third, the reading makes the argumentation that the European fur traders were the main cause of extinction of sea cows. The professor refutes this claim by pointing out that the population of these marine animals had declined before the arrival of European fur trader to that island. Thus, these people couldn't consider the main reason of sea cows.
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Grammar and spelling errors:
Line 1, column 104, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: aren't
...come extinct in 1768 and although there arent clear reason for their extinction, ther...
^^^^^
Line 3, column 334, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: wasn't
...es that the population of native people wasnt so many. Therefore, they didnt to hunt ...
^^^^^
Line 3, column 365, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: didn't
...e people wasnt so many. Therefore, they didnt to hunt and kill a lot of them. Sec...
^^^^^
Line 5, column 388, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: didn't
...more, the professor mentions that there didnt have any report on whale decline on tha...
^^^^^
Line 5, column 435, Rule ID: PERIOD_OF_TIME[1]
Message: Use simply 'period'.
Suggestion: period
...ave any report on whale decline on that period of time. Hence, ecosystems disturbances couldnt...
^^^^^^^^^^^^^^
Line 5, column 482, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: couldn't
...of time. Hence, ecosystems disturbances couldnt be the reason for extinction. Third...
^^^^^^^
Line 7, column 304, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: couldn't
...ader to that island. Thus, these people couldnt consider the main reason of sea cows. ...
^^^^^^^
Transition Words or Phrases used:
first, furthermore, hence, however, if, second, so, therefore, third, thus, in addition, as a result
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 5.0 10.4613686534 48% => More to be verbs wanted.
Auxiliary verbs: 3.0 5.04856512141 59% => OK
Conjunction : 4.0 7.30242825607 55% => More conjunction wanted.
Relative clauses : 15.0 12.0772626932 124% => OK
Pronoun: 25.0 22.412803532 112% => OK
Preposition: 32.0 30.3222958057 106% => OK
Nominalization: 9.0 5.01324503311 180% => OK
Performance on vocabulary words:
No of characters: 1342.0 1373.03311258 98% => OK
No of words: 267.0 270.72406181 99% => OK
Chars per words: 5.02621722846 5.08290768461 99% => OK
Fourth root words length: 4.04229324003 4.04702891845 100% => OK
Word Length SD: 2.61148885387 2.5805825403 101% => OK
Unique words: 149.0 145.348785872 103% => OK
Unique words percentage: 0.558052434457 0.540411800872 103% => OK
syllable_count: 405.9 419.366225166 97% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 4.0 3.25607064018 123% => OK
Article: 10.0 8.23620309051 121% => OK
Subordination: 0.0 1.25165562914 0% => More adverbial clause wanted.
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 3.0 2.5761589404 116% => OK
Performance on sentences:
How many sentences: 13.0 13.0662251656 99% => OK
Sentence length: 20.0 21.2450331126 94% => OK
Sentence length SD: 44.9287404228 49.2860985944 91% => OK
Chars per sentence: 103.230769231 110.228320801 94% => OK
Words per sentence: 20.5384615385 21.698381199 95% => OK
Discourse Markers: 7.69230769231 7.06452816374 109% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 7.0 4.19205298013 167% => OK
Sentences with positive sentiment : 2.0 4.33554083885 46% => More positive sentences wanted.
Sentences with negative sentiment : 6.0 4.45695364238 135% => 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: 0.468189558562 0.272083759551 172% => OK
Sentence topic coherence: 0.148707335083 0.0996497079465 149% => OK
Sentence topic coherence SD: 0.0926927316651 0.0662205650399 140% => OK
Paragraph topic coherence: 0.271204565011 0.162205337803 167% => OK
Paragraph topic coherence SD: 0.0465590182217 0.0443174109184 105% => OK
Essay readability:
automated_readability_index: 12.5 13.3589403974 94% => Automated_readability_index is low.
flesch_reading_ease: 59.64 53.8541721854 111% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 9.9 11.0289183223 90% => OK
coleman_liau_index: 11.89 12.2367328918 97% => OK
dale_chall_readability_score: 8.53 8.42419426049 101% => OK
difficult_words: 66.0 63.6247240618 104% => OK
linsear_write_formula: 13.5 10.7273730684 126% => OK
gunning_fog: 10.0 10.498013245 95% => OK
text_standard: 10.0 11.2008830022 89% => OK
What are above readability scores?
---------------------
Rates: 80.0 out of 100
Scores by essay e-grader: 24.0 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.