The lecture and the passage both discusses about the causes of extinction of sea cows in Siberian islands.
The passage provides three theories about main cause of the extinction. The lecturer however, finds all points made by the passage problematic to believe and provides reasons for his assumptions.
First of all, the sea cows were hunted excessively by the native Siberian people, as it was a very good food source. The professor doubts this point and mentions that sea cows were huge creatures of 9cm long and could weigh 10 tons. Even though, native people used to hunt a sea cow, it would last them for months, owing to it's size. Moreover, the population on that island was very minimal, so hunting by them could not be a reason of extinction.
second, another cause stated by author is that there was a disturbance in ecosystem that led to decrease in food source of sea cows; which is a sea plant called Kemp. The lecturer refutes to this point. He claims that there isn't any evidence of disturbed ecosystem because all other marine animals were in abundance. The disturbance might had cause there extinction too; which is not the case.
Finally, the writer proposes that European fur traders who arrived in Siberia in 1741 had weapons which might have enabled them to kill such massive animal easily and quickly. On the other hand, the speaker posits that the sea cows were already on the verge extinction when these European fur traders arrived. There might be some serious ongoing unknown factor causing there extinction. The fur traders were last to arrive on the island; they could not be a reason for such decline in sea cow population and extinction.
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Grammar and spelling errors:
Line 2, column 72, Rule ID: ENGLISH_WORD_REPEAT_BEGINNING_RULE
Message: Three successive sentences begin with the same word. Reword the sentence or use a thesaurus to find a synonym.
...ies about main cause of the extinction. The lecturer however, finds all points made...
^^^
Line 6, column 1, Rule ID: UPPERCASE_SENTENCE_START
Message: This sentence does not start with an uppercase letter
Suggestion: Second
...could not be a reason of extinction. second, another cause stated by author is that...
^^^^^^
Line 6, column 225, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: isn't
...tes to this point. He claims that there isnt any evidence of disturbed ecosystem bec...
^^^^
Line 8, column 426, Rule ID: WHITESPACE_RULE
Message: Possible typo: you repeated a whitespace
Suggestion:
.... The fur traders were last to arrive on the island; they could not be a reason f...
^^
Transition Words or Phrases used:
finally, first, however, moreover, second, so, first of all, on the other hand
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 14.0 10.4613686534 134% => OK
Auxiliary verbs: 7.0 5.04856512141 139% => OK
Conjunction : 6.0 7.30242825607 82% => OK
Relative clauses : 12.0 12.0772626932 99% => OK
Pronoun: 19.0 22.412803532 85% => OK
Preposition: 32.0 30.3222958057 106% => OK
Nominalization: 13.0 5.01324503311 259% => Less nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1394.0 1373.03311258 102% => OK
No of words: 287.0 270.72406181 106% => OK
Chars per words: 4.85714285714 5.08290768461 96% => OK
Fourth root words length: 4.11595363751 4.04702891845 102% => OK
Word Length SD: 2.40765289911 2.5805825403 93% => OK
Unique words: 158.0 145.348785872 109% => OK
Unique words percentage: 0.550522648084 0.540411800872 102% => OK
syllable_count: 426.6 419.366225166 102% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 3.0 3.25607064018 92% => OK
Interrogative: 0.0 0.116997792494 0% => OK
Article: 11.0 8.23620309051 134% => OK
Subordination: 2.0 1.25165562914 160% => OK
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 2.0 2.5761589404 78% => OK
Performance on sentences:
How many sentences: 15.0 13.0662251656 115% => OK
Sentence length: 19.0 21.2450331126 89% => OK
Sentence length SD: 34.8720837092 49.2860985944 71% => OK
Chars per sentence: 92.9333333333 110.228320801 84% => OK
Words per sentence: 19.1333333333 21.698381199 88% => OK
Discourse Markers: 5.2 7.06452816374 74% => OK
Paragraphs: 5.0 4.09492273731 122% => OK
Language errors: 4.0 4.19205298013 95% => OK
Sentences with positive sentiment : 3.0 4.33554083885 69% => OK
Sentences with negative sentiment : 6.0 4.45695364238 135% => OK
Sentences with neutral sentiment: 6.0 4.27373068433 140% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.511522910726 0.272083759551 188% => OK
Sentence topic coherence: 0.161510600272 0.0996497079465 162% => OK
Sentence topic coherence SD: 0.0937941820671 0.0662205650399 142% => OK
Paragraph topic coherence: 0.258101357633 0.162205337803 159% => OK
Paragraph topic coherence SD: 0.0912796532417 0.0443174109184 206% => More connections among paragraphs wanted.
Essay readability:
automated_readability_index: 11.0 13.3589403974 82% => Automated_readability_index is low.
flesch_reading_ease: 60.65 53.8541721854 113% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 9.5 11.0289183223 86% => OK
coleman_liau_index: 10.91 12.2367328918 89% => OK
dale_chall_readability_score: 7.77 8.42419426049 92% => OK
difficult_words: 58.0 63.6247240618 91% => OK
linsear_write_formula: 7.5 10.7273730684 70% => OK
gunning_fog: 9.6 10.498013245 91% => OK
text_standard: 8.0 11.2008830022 71% => OK
What are above readability scores?
---------------------
Rates: 60.0 out of 100
Scores by essay e-grader: 18.0 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.