The article states that Steller's sea cow, a huge marine mammal lived in the waters around Bering island off the coast of Siberia, became extinct in 1768. Three reasons are mentioned in the passage as the main reasons of sea cows’ extinction. However, the professor explains that we do not know the main reason of extinction, and there are problems with the passage's reasons. He also refutes each of the author's reasons.
First, the reading claims that hundreds of years of over hunting by the native people, may be the main cause of sea cows’ extinction. The professor refutes this point by saying that sea cows were too large. They were 9 meters long, so couple of them would have been enough for villages of natives for months. He also states that the natives did not hunt a lot of sea cows, therefore their hunting was not the main cause of sea cows’ extinction.
Second, the article posits that ecosystems disturbances caused sea cows extinction. These disturbances declined the main source of sea cow’s food, kelp. However, the professor says that if something really had happened to ecosystems, it would have affected other animals too, like whales. According to the professor there are no records of the whales’ population decline in that period, because of ecosystems disturbances. Therefor no disturbances happened then, and sea cows did not experience food shortage.
Third, the passage says that the extinction of sea cows might be caused by European far traders. The last sea cow was captured by these far traders, and they have weapons that could kill a large number of sea cows. The professor opposes this point by explaining that the sea cows’ population was already quit small when European far traders arrive. We also learn that population of sea cows was at its largest hundreds of years before sea traders’ arrival, so the main cause of decline in the sea cow's population was something else. Whatever caused this declination, should be considered the main reason for sea cow's extinction.
Grammar and spelling errors:
Line 7, column 188, Rule ID: LARGE_NUMBER_OF[1]
Message: Specify a number, remove phrase, or simply use 'many' or 'numerous'
Suggestion: many; numerous
..., and they have weapons that could kill a large number of sea cows. The professor opposes this po...
^^^^^^^^^^^^^^^^^
Line 7, column 508, Rule ID: POSSESIVE_APOSTROPHE[1]
Message: Possible typo: apostrophe is missing. Did you mean 'cows'' or 'cow's'?
Suggestion: cows'; cow's
...so the main cause of decline in the sea cows population was something else. Whatever...
^^^^
Transition Words or Phrases used:
also, first, however, if, may, really, second, so, then, therefore, third
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 : 13.0 12.0772626932 108% => OK
Pronoun: 27.0 22.412803532 120% => Less pronouns wanted
Preposition: 38.0 30.3222958057 125% => OK
Nominalization: 10.0 5.01324503311 199% => OK
Performance on vocabulary words:
No of characters: 1715.0 1373.03311258 125% => OK
No of words: 338.0 270.72406181 125% => OK
Chars per words: 5.07396449704 5.08290768461 100% => OK
Fourth root words length: 4.28774723029 4.04702891845 106% => OK
Word Length SD: 2.65838074788 2.5805825403 103% => OK
Unique words: 171.0 145.348785872 118% => OK
Unique words percentage: 0.505917159763 0.540411800872 94% => More unique words wanted or less content wanted.
syllable_count: 513.0 419.366225166 122% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 6.0 3.25607064018 184% => OK
Article: 10.0 8.23620309051 121% => OK
Subordination: 1.0 1.25165562914 80% => OK
Conjunction: 3.0 1.51434878587 198% => OK
Preposition: 3.0 2.5761589404 116% => OK
Performance on sentences:
How many sentences: 18.0 13.0662251656 138% => OK
Sentence length: 18.0 21.2450331126 85% => The Avg. Sentence Length is relatively short.
Sentence length SD: 34.60058695 49.2860985944 70% => OK
Chars per sentence: 95.2777777778 110.228320801 86% => OK
Words per sentence: 18.7777777778 21.698381199 87% => OK
Discourse Markers: 4.05555555556 7.06452816374 57% => More transition words/phrases wanted.
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 2.0 4.19205298013 48% => 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: 10.0 4.27373068433 234% => Less facts, knowledge or examples wanted.
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.251642844065 0.272083759551 92% => OK
Sentence topic coherence: 0.0967120654751 0.0996497079465 97% => OK
Sentence topic coherence SD: 0.0660948693487 0.0662205650399 100% => OK
Paragraph topic coherence: 0.164875058108 0.162205337803 102% => OK
Paragraph topic coherence SD: 0.0287599207254 0.0443174109184 65% => OK
Essay readability:
automated_readability_index: 11.8 13.3589403974 88% => Automated_readability_index is low.
flesch_reading_ease: 61.67 53.8541721854 115% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 9.1 11.0289183223 83% => OK
coleman_liau_index: 12.13 12.2367328918 99% => OK
dale_chall_readability_score: 7.85 8.42419426049 93% => OK
difficult_words: 71.0 63.6247240618 112% => OK
linsear_write_formula: 7.5 10.7273730684 70% => OK
gunning_fog: 9.2 10.498013245 88% => OK
text_standard: 8.0 11.2008830022 71% => OK
What are above readability scores?
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Write the essay in 20 minutes.
Rates: 71.6666666667 out of 100
Scores by essay e-grader: 21.5 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.