The main idea of both the text and the lecture is about extinction of sea cows, which lived in waters of Bering Island. The author of the reading, by providing three theories, explains the main cause of the extinction, however the lecturer says that we do not know the main cause of extinction and the theories mentioned in the text have problems for the following reasons.
To begin with, the writer of the passage brings about theory of overhunting of these sea cows, which caused the extinction because sea cows were large and good source of food for native Siberian people. On the other hand, the lecturer casts doubt about this idea and states that sea cows are massive and huge and some of them can feed the local people for months, because the population of native people were not large. As a result, there were some hunting but it was not a lot and it is not the reason of the extinction of these sea cows.
Secondly, the writer of the article puts forth the extinction of sea cows main source of food, which was kelp. Since kelp population decreased due to bad ecological changes, sea cows extinct. The professor, on the contrary, points out that ecological disturbances should decrease other marine animals, like whales, and not just kelp. Hence, this theory is not correct and kelp grew fine and there were no food shortages for sea cows.
Thirdly, the writer of the passage puts forward the European fur traders, who believed to be hunting these sea cows with their intricate weapons and cause the extinction of these animals. Conversely, the speaker disagrees with this notion too by saying that by Europeans arrival the sea cow’s population was already small. So, there must be something serious before European peoples' arrival and this serious change caused the extinction of sea cows and not Europeans.
Essay evaluations by e-grader
Transition Words or Phrases used:
but, conversely, hence, however, second, secondly, so, third, thirdly, as a result, on the contrary, to begin with, 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: 3.0 5.04856512141 59% => OK
Conjunction : 14.0 7.30242825607 192% => OK
Relative clauses : 8.0 12.0772626932 66% => More relative clauses wanted.
Pronoun: 17.0 22.412803532 76% => OK
Preposition: 40.0 30.3222958057 132% => OK
Nominalization: 11.0 5.01324503311 219% => Less nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1512.0 1373.03311258 110% => OK
No of words: 314.0 270.72406181 116% => OK
Chars per words: 4.8152866242 5.08290768461 95% => OK
Fourth root words length: 4.20951839842 4.04702891845 104% => OK
Word Length SD: 2.36624846764 2.5805825403 92% => OK
Unique words: 157.0 145.348785872 108% => OK
Unique words percentage: 0.5 0.540411800872 93% => More unique words wanted or less content wanted.
syllable_count: 456.3 419.366225166 109% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 1.0 3.25607064018 31% => OK
Article: 8.0 8.23620309051 97% => OK
Subordination: 3.0 1.25165562914 240% => Less adverbial clause wanted.
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 6.0 2.5761589404 233% => Less preposition wanted as sentence beginnings.
Performance on sentences:
How many sentences: 12.0 13.0662251656 92% => OK
Sentence length: 26.0 21.2450331126 122% => The Avg. Sentence Length is relatively long.
Sentence length SD: 50.3082166914 49.2860985944 102% => OK
Chars per sentence: 126.0 110.228320801 114% => OK
Words per sentence: 26.1666666667 21.698381199 121% => OK
Discourse Markers: 11.0833333333 7.06452816374 157% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 0.0 4.19205298013 0% => 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: 3.0 4.27373068433 70% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.136340269218 0.272083759551 50% => OK
Sentence topic coherence: 0.0626914868637 0.0996497079465 63% => OK
Sentence topic coherence SD: 0.0369100489631 0.0662205650399 56% => OK
Paragraph topic coherence: 0.0862103850419 0.162205337803 53% => OK
Paragraph topic coherence SD: 0.0222026223328 0.0443174109184 50% => OK
Essay readability:
automated_readability_index: 14.4 13.3589403974 108% => OK
flesch_reading_ease: 53.55 53.8541721854 99% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 12.3 11.0289183223 112% => OK
coleman_liau_index: 10.97 12.2367328918 90% => OK
dale_chall_readability_score: 7.89 8.42419426049 94% => OK
difficult_words: 59.0 63.6247240618 93% => OK
linsear_write_formula: 17.0 10.7273730684 158% => OK
gunning_fog: 12.4 10.498013245 118% => OK
text_standard: 17.0 11.2008830022 152% => OK
What are above readability scores?
---------------------
Rates: 80.0 out of 100
Scores by essay e-grader: 24.0 Out of 30
---------------------
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.
Transition Words or Phrases used:
but, conversely, hence, however, second, secondly, so, third, thirdly, as a result, on the contrary, to begin with, 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: 3.0 5.04856512141 59% => OK
Conjunction : 14.0 7.30242825607 192% => OK
Relative clauses : 8.0 12.0772626932 66% => More relative clauses wanted.
Pronoun: 17.0 22.412803532 76% => OK
Preposition: 40.0 30.3222958057 132% => OK
Nominalization: 11.0 5.01324503311 219% => Less nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1512.0 1373.03311258 110% => OK
No of words: 314.0 270.72406181 116% => OK
Chars per words: 4.8152866242 5.08290768461 95% => OK
Fourth root words length: 4.20951839842 4.04702891845 104% => OK
Word Length SD: 2.36624846764 2.5805825403 92% => OK
Unique words: 157.0 145.348785872 108% => OK
Unique words percentage: 0.5 0.540411800872 93% => More unique words wanted or less content wanted.
syllable_count: 456.3 419.366225166 109% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 1.0 3.25607064018 31% => OK
Article: 8.0 8.23620309051 97% => OK
Subordination: 3.0 1.25165562914 240% => Less adverbial clause wanted.
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 6.0 2.5761589404 233% => Less preposition wanted as sentence beginnings.
Performance on sentences:
How many sentences: 12.0 13.0662251656 92% => OK
Sentence length: 26.0 21.2450331126 122% => The Avg. Sentence Length is relatively long.
Sentence length SD: 50.3082166914 49.2860985944 102% => OK
Chars per sentence: 126.0 110.228320801 114% => OK
Words per sentence: 26.1666666667 21.698381199 121% => OK
Discourse Markers: 11.0833333333 7.06452816374 157% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 0.0 4.19205298013 0% => 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: 3.0 4.27373068433 70% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.136340269218 0.272083759551 50% => OK
Sentence topic coherence: 0.0626914868637 0.0996497079465 63% => OK
Sentence topic coherence SD: 0.0369100489631 0.0662205650399 56% => OK
Paragraph topic coherence: 0.0862103850419 0.162205337803 53% => OK
Paragraph topic coherence SD: 0.0222026223328 0.0443174109184 50% => OK
Essay readability:
automated_readability_index: 14.4 13.3589403974 108% => OK
flesch_reading_ease: 53.55 53.8541721854 99% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 12.3 11.0289183223 112% => OK
coleman_liau_index: 10.97 12.2367328918 90% => OK
dale_chall_readability_score: 7.89 8.42419426049 94% => OK
difficult_words: 59.0 63.6247240618 93% => OK
linsear_write_formula: 17.0 10.7273730684 158% => OK
gunning_fog: 12.4 10.498013245 118% => OK
text_standard: 17.0 11.2008830022 152% => OK
What are above readability scores?
---------------------
Rates: 80.0 out of 100
Scores by essay e-grader: 24.0 Out of 30
---------------------
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.