In this set of material, the reading passage provide three theories that would account for the sea cow's extinction. However, in the eyes of the lecture, the real reasons of the extinction are still not clear and none of these theories are acceptable.
The author believes that, overhunting sea cows by native Siberian people for hundred of years could have been the main cause of extinction. On the contrary, the speaker argues that sea cows were massive creatures and the native people did not need to hunt a large group of them, because the population of Siberian was not large.
In addition, the reading passage declare sea cows may have become extinct because of ecosystem disturbances, which caused a decrease of the Kelp that these creatures was depend on. However, the professor refute this theory, because if there were severe ecosystem disturbances, other marine species, such as whales, would be affected. Since, there is no broader ecosystem problem, the kelp was growing just fine and as a result, the sea cows did not experience food shortage.
Furthermore, the writer expresses the sea cows became extinct, because many European fur traders hunted these animals. By contrast, based on listening part, European were not the main cause of the sea cow's extinction, because the population of these animals was quite small when the fur traders came. Evidence has shown that the number of sea cows was at its largest several centuries before the 1700s. Therefore, there must have been another reason that caused a serious decline in sea cow population before the European's arrival.
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Grammar and spelling errors:
Line 1, column 100, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'cows'' or 'cow's'?
Suggestion: cows'; cow's
...theories that would account for the sea cows extinction. However, in the eyes of the...
^^^^
Line 2, column 78, Rule ID: NODT_DOZEN[1]
Message: Use simply: 'a hundred'.
Suggestion: a hundred
... sea cows by native Siberian people for hundred of years could have been the main cause...
^^^^^^^
Line 3, column 171, Rule ID: BEEN_PART_AGREEMENT[1]
Message: Consider using a past participle here: 'depended'.
Suggestion: depended
...se of the Kelp that these creatures was depend on. However, the professor refute this ...
^^^^^^
Transition Words or Phrases used:
furthermore, however, if, may, so, still, therefore, in addition, such as, as a result, on the contrary
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 14.0 10.4613686534 134% => OK
Auxiliary verbs: 6.0 5.04856512141 119% => OK
Conjunction : 3.0 7.30242825607 41% => More conjunction wanted.
Relative clauses : 8.0 12.0772626932 66% => OK
Pronoun: 14.0 22.412803532 62% => OK
Preposition: 26.0 30.3222958057 86% => OK
Nominalization: 10.0 5.01324503311 199% => OK
Performance on vocabulary words:
No of characters: 1331.0 1373.03311258 97% => OK
No of words: 262.0 270.72406181 97% => OK
Chars per words: 5.08015267176 5.08290768461 100% => OK
Fourth root words length: 4.02323427807 4.04702891845 99% => OK
Word Length SD: 2.52479401425 2.5805825403 98% => OK
Unique words: 146.0 145.348785872 100% => OK
Unique words percentage: 0.557251908397 0.540411800872 103% => OK
syllable_count: 416.7 419.366225166 99% => OK
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
Interrogative: 0.0 0.116997792494 0% => OK
Article: 9.0 8.23620309051 109% => OK
Subordination: 4.0 1.25165562914 320% => Less adverbial clause wanted.
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 5.0 2.5761589404 194% => OK
Performance on sentences:
How many sentences: 11.0 13.0662251656 84% => OK
Sentence length: 23.0 21.2450331126 108% => OK
Sentence length SD: 27.6704335449 49.2860985944 56% => The essay contains lots of sentences with the similar length. More sentence varieties wanted.
Chars per sentence: 121.0 110.228320801 110% => OK
Words per sentence: 23.8181818182 21.698381199 110% => OK
Discourse Markers: 9.36363636364 7.06452816374 133% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 3.0 4.19205298013 72% => OK
Sentences with positive sentiment : 2.0 4.33554083885 46% => More positive sentences wanted.
Sentences with negative sentiment : 5.0 4.45695364238 112% => OK
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: 0.607908367049 0.272083759551 223% => OK
Sentence topic coherence: 0.244972902397 0.0996497079465 246% => Sentence topic similarity is high.
Sentence topic coherence SD: 0.11967653709 0.0662205650399 181% => OK
Paragraph topic coherence: 0.364126864066 0.162205337803 224% => OK
Paragraph topic coherence SD: 0.127556310169 0.0443174109184 288% => More connections among paragraphs wanted.
Essay readability:
automated_readability_index: 14.4 13.3589403974 108% => OK
flesch_reading_ease: 48.13 53.8541721854 89% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 12.3 11.0289183223 112% => OK
coleman_liau_index: 12.48 12.2367328918 102% => OK
dale_chall_readability_score: 8.45 8.42419426049 100% => OK
difficult_words: 61.0 63.6247240618 96% => OK
linsear_write_formula: 13.5 10.7273730684 126% => OK
gunning_fog: 11.2 10.498013245 107% => OK
text_standard: 14.0 11.2008830022 125% => 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.