Based on the given materials, the article as well as the lecture discusses Steller's sea cows which were first founded by G.W. Steller in 1741 around Siberia, and they were became extinct in 1768. The author states that there are several viable theories regarding this extinction. That being said, the lecturer provides several reasons to repudiate this claim.
Initially, the writer says that population of the sea cows had been quite large before Siberian people started to overhunt these marine animals, as their source of food in a severe environment. However, the speaker explains that the sea cows were massive creatures, with ten tones weights and nine meters length; couple of these animals could be used by Siberian villages for months. Since the Siberian population were not large, they did not have to start an overhunting process.
Second, the author proclaims that ecosystem fluctuations affected populations of kelp, which were food source of the sea cows and directly related to population decrease of the sea cows. Yet again, the lecturer underscores that if any severe ecological changes occurred before 1768, there would be seen different decreases not only in kelp populations but also, in other marine species, such as whales. But according to reports of local fisher men, never did any fisher men announce any decline in whales' populations. Thus, ecological changes could not have been counted as a main reason of the sea cows' extinctions.
The final point of contention between the reading and the listening passage is European traders. The author thinks that using special weapons for hunting large groups of sea cow, European traders causes the sea cows' extinction. On the other hand, the speaker explains that the population of sea cows had started to decline hundred years before 1700s, in which European traders came to this place. Although, never should the European traders be counted as the causes for the extinction, if any researcher want to find out the main reason, s/he should investigate conditions right after the decline started.
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Grammar and spelling errors:
Line 1, column 173, Rule ID: BEEN_PART_AGREEMENT[1]
Message: Consider using a past participle here: 'become'.
Suggestion: become
...r in 1741 around Siberia, and they were became extinct in 1768. The author states that...
^^^^^^
Line 4, column 212, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'cows'' or 'cow's'?
Suggestion: cows'; cow's
...ea cow, European traders causes the sea cows extinction. On the other hand, the spea...
^^^^
Line 4, column 324, Rule ID: NODT_DOZEN[1]
Message: Use simply: 'a hundred'.
Suggestion: a hundred
...tion of sea cows had started to decline hundred years before 1700s, in which European t...
^^^^^^^
Transition Words or Phrases used:
also, but, first, however, if, regarding, second, so, thus, well, such as, as well as, on the other hand
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 13.0 10.4613686534 124% => OK
Auxiliary verbs: 5.0 5.04856512141 99% => OK
Conjunction : 7.0 7.30242825607 96% => OK
Relative clauses : 11.0 12.0772626932 91% => OK
Pronoun: 17.0 22.412803532 76% => OK
Preposition: 40.0 30.3222958057 132% => OK
Nominalization: 9.0 5.01324503311 180% => OK
Performance on vocabulary words:
No of characters: 1738.0 1373.03311258 127% => OK
No of words: 334.0 270.72406181 123% => OK
Chars per words: 5.20359281437 5.08290768461 102% => OK
Fourth root words length: 4.27500489853 4.04702891845 106% => OK
Word Length SD: 2.5058145298 2.5805825403 97% => OK
Unique words: 187.0 145.348785872 129% => OK
Unique words percentage: 0.559880239521 0.540411800872 104% => OK
syllable_count: 523.8 419.366225166 125% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 2.0 3.25607064018 61% => OK
Article: 10.0 8.23620309051 121% => OK
Subordination: 3.0 1.25165562914 240% => Less adverbial clause wanted.
Conjunction: 3.0 1.51434878587 198% => OK
Preposition: 5.0 2.5761589404 194% => OK
Performance on sentences:
How many sentences: 14.0 13.0662251656 107% => OK
Sentence length: 23.0 21.2450331126 108% => OK
Sentence length SD: 49.4161834187 49.2860985944 100% => OK
Chars per sentence: 124.142857143 110.228320801 113% => OK
Words per sentence: 23.8571428571 21.698381199 110% => OK
Discourse Markers: 7.42857142857 7.06452816374 105% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 3.0 4.19205298013 72% => OK
Sentences with positive sentiment : 3.0 4.33554083885 69% => OK
Sentences with negative sentiment : 4.0 4.45695364238 90% => OK
Sentences with neutral sentiment: 7.0 4.27373068433 164% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.486714737241 0.272083759551 179% => OK
Sentence topic coherence: 0.16544719769 0.0996497079465 166% => OK
Sentence topic coherence SD: 0.130067251221 0.0662205650399 196% => OK
Paragraph topic coherence: 0.279639723253 0.162205337803 172% => OK
Paragraph topic coherence SD: 0.0592173828843 0.0443174109184 134% => OK
Essay readability:
automated_readability_index: 15.0 13.3589403974 112% => 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: 13.18 12.2367328918 108% => OK
dale_chall_readability_score: 8.89 8.42419426049 106% => OK
difficult_words: 87.0 63.6247240618 137% => OK
linsear_write_formula: 10.5 10.7273730684 98% => OK
gunning_fog: 11.2 10.498013245 107% => OK
text_standard: 11.0 11.2008830022 98% => OK
What are above readability scores?
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Write the essay in 20 minutes.
Rates: 81.6666666667 out of 100
Scores by essay e-grader: 24.5 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.