extinction of sea cows
The reading passage presents three possible theories about the extinction of the Steller's sea cow in 1768. The lecturer contradicts points made in article and claims none of them are plausible. His further demonstrations are as follows.
Firstly, the sea cows were enormous creatures. They were more than nine meters long and weighed almost ten kilograms. Although native Siberians hunted them, they would not have to hunt many of them due to the small population in their villages and huge size of the sea cows. Thus, it is not likely that overhunting by native Siberians contributed to the animal's extinction.
Secondly, the lecturer points out that if there an extreme disturbance in the ecosystem, other types of marine animals such as whales would have been affected as well. Nevertheless, evidence shows that whales population was not altered. Therefore, we can conclude that kelp populations, as the food supply for sea cows, did not decrease.
Finally, despite the appearence that European fur traders arrival caused sea cow populations to decline, it actually is not true. The peak of the sea cow population bloom was hundreds of years before the 1700s, and while the Europeans were last to arrive, the decline in sea cow population had started many years before. In conclusion, something significant and yet unknown other than the ideas mentioned in the reading passage has caused the Steller's sea cow to become extinct and it had been in action from along time before the European fur traders' emergence.
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Comments
Essay evaluations by e-grader
Grammar and spelling errors:
Line 3, column 355, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'animals'' or 'animal's'?
Suggestion: animals'; animal's
... by native Siberians contributed to the animals extinction. Secondly, the lecturer p...
^^^^^^^
Line 7, column 51, Rule ID: POSSESIVE_APOSTROPHE[1]
Message: Possible typo: apostrophe is missing. Did you mean 'traders'' or 'trader's'?
Suggestion: traders'; trader's
...espite the appearence that European fur traders arrival caused sea cow populations to d...
^^^^^^^
Line 7, column 510, Rule ID: ALONG_TIME[1]
Message: Did you mean 'a long time'?
Suggestion: a long time
... extinct and it had been in action from along time before the European fur traders emergen...
^^^^^^^^^^
Line 7, column 545, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'traders'' or 'trader's'?
Suggestion: traders'; trader's
...from along time before the European fur traders emergence.
^^^^^^^
Transition Words or Phrases used:
actually, but, finally, first, firstly, if, nevertheless, second, secondly, so, therefore, thus, well, while, in conclusion, such as
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 11.0 10.4613686534 105% => OK
Auxiliary verbs: 3.0 5.04856512141 59% => OK
Conjunction : 7.0 7.30242825607 96% => OK
Relative clauses : 5.0 12.0772626932 41% => More relative clauses wanted.
Pronoun: 16.0 22.412803532 71% => OK
Preposition: 30.0 30.3222958057 99% => OK
Nominalization: 10.0 5.01324503311 199% => OK
Performance on vocabulary words:
No of characters: 1276.0 1373.03311258 93% => OK
No of words: 248.0 270.72406181 92% => More content wanted.
Chars per words: 5.14516129032 5.08290768461 101% => OK
Fourth root words length: 3.96837696647 4.04702891845 98% => OK
Word Length SD: 2.67882784561 2.5805825403 104% => OK
Unique words: 149.0 145.348785872 103% => OK
Unique words percentage: 0.600806451613 0.540411800872 111% => OK
syllable_count: 392.4 419.366225166 94% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 6.0 3.25607064018 184% => OK
Article: 6.0 8.23620309051 73% => OK
Subordination: 2.0 1.25165562914 160% => OK
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 2.0 2.5761589404 78% => OK
Performance on sentences:
How many sentences: 13.0 13.0662251656 99% => OK
Sentence length: 19.0 21.2450331126 89% => OK
Sentence length SD: 56.7320078092 49.2860985944 115% => OK
Chars per sentence: 98.1538461538 110.228320801 89% => OK
Words per sentence: 19.0769230769 21.698381199 88% => OK
Discourse Markers: 10.1538461538 7.06452816374 144% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 4.0 4.19205298013 95% => OK
Sentences with positive sentiment : 2.0 4.33554083885 46% => More positive sentences wanted.
Sentences with negative sentiment : 3.0 4.45695364238 67% => OK
Sentences with neutral sentiment: 8.0 4.27373068433 187% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.379693008574 0.272083759551 140% => OK
Sentence topic coherence: 0.120140429015 0.0996497079465 121% => OK
Sentence topic coherence SD: 0.135859365397 0.0662205650399 205% => The coherence between sentences is low.
Paragraph topic coherence: 0.205193414082 0.162205337803 127% => OK
Paragraph topic coherence SD: 0.12129675138 0.0443174109184 274% => More connections among paragraphs wanted.
Essay readability:
automated_readability_index: 12.4 13.3589403974 93% => Automated_readability_index is low.
flesch_reading_ease: 52.19 53.8541721854 97% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 10.7 11.0289183223 97% => OK
coleman_liau_index: 12.59 12.2367328918 103% => OK
dale_chall_readability_score: 8.78 8.42419426049 104% => OK
difficult_words: 66.0 63.6247240618 104% => OK
linsear_write_formula: 6.5 10.7273730684 61% => OK
gunning_fog: 9.6 10.498013245 91% => OK
text_standard: 13.0 11.2008830022 116% => OK
What are above readability scores?
---------------------
Rates: 75.0 out of 100
Scores by essay e-grader: 22.5 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.
Grammar and spelling errors:
Line 3, column 355, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'animals'' or 'animal's'?
Suggestion: animals'; animal's
... by native Siberians contributed to the animals extinction. Secondly, the lecturer p...
^^^^^^^
Line 7, column 51, Rule ID: POSSESIVE_APOSTROPHE[1]
Message: Possible typo: apostrophe is missing. Did you mean 'traders'' or 'trader's'?
Suggestion: traders'; trader's
...espite the appearence that European fur traders arrival caused sea cow populations to d...
^^^^^^^
Line 7, column 510, Rule ID: ALONG_TIME[1]
Message: Did you mean 'a long time'?
Suggestion: a long time
... extinct and it had been in action from along time before the European fur traders emergen...
^^^^^^^^^^
Line 7, column 545, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'traders'' or 'trader's'?
Suggestion: traders'; trader's
...from along time before the European fur traders emergence.
^^^^^^^
Transition Words or Phrases used:
actually, but, finally, first, firstly, if, nevertheless, second, secondly, so, therefore, thus, well, while, in conclusion, such as
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 11.0 10.4613686534 105% => OK
Auxiliary verbs: 3.0 5.04856512141 59% => OK
Conjunction : 7.0 7.30242825607 96% => OK
Relative clauses : 5.0 12.0772626932 41% => More relative clauses wanted.
Pronoun: 16.0 22.412803532 71% => OK
Preposition: 30.0 30.3222958057 99% => OK
Nominalization: 10.0 5.01324503311 199% => OK
Performance on vocabulary words:
No of characters: 1276.0 1373.03311258 93% => OK
No of words: 248.0 270.72406181 92% => More content wanted.
Chars per words: 5.14516129032 5.08290768461 101% => OK
Fourth root words length: 3.96837696647 4.04702891845 98% => OK
Word Length SD: 2.67882784561 2.5805825403 104% => OK
Unique words: 149.0 145.348785872 103% => OK
Unique words percentage: 0.600806451613 0.540411800872 111% => OK
syllable_count: 392.4 419.366225166 94% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 6.0 3.25607064018 184% => OK
Article: 6.0 8.23620309051 73% => OK
Subordination: 2.0 1.25165562914 160% => OK
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 2.0 2.5761589404 78% => OK
Performance on sentences:
How many sentences: 13.0 13.0662251656 99% => OK
Sentence length: 19.0 21.2450331126 89% => OK
Sentence length SD: 56.7320078092 49.2860985944 115% => OK
Chars per sentence: 98.1538461538 110.228320801 89% => OK
Words per sentence: 19.0769230769 21.698381199 88% => OK
Discourse Markers: 10.1538461538 7.06452816374 144% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 4.0 4.19205298013 95% => OK
Sentences with positive sentiment : 2.0 4.33554083885 46% => More positive sentences wanted.
Sentences with negative sentiment : 3.0 4.45695364238 67% => OK
Sentences with neutral sentiment: 8.0 4.27373068433 187% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.379693008574 0.272083759551 140% => OK
Sentence topic coherence: 0.120140429015 0.0996497079465 121% => OK
Sentence topic coherence SD: 0.135859365397 0.0662205650399 205% => The coherence between sentences is low.
Paragraph topic coherence: 0.205193414082 0.162205337803 127% => OK
Paragraph topic coherence SD: 0.12129675138 0.0443174109184 274% => More connections among paragraphs wanted.
Essay readability:
automated_readability_index: 12.4 13.3589403974 93% => Automated_readability_index is low.
flesch_reading_ease: 52.19 53.8541721854 97% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 10.7 11.0289183223 97% => OK
coleman_liau_index: 12.59 12.2367328918 103% => OK
dale_chall_readability_score: 8.78 8.42419426049 104% => OK
difficult_words: 66.0 63.6247240618 104% => OK
linsear_write_formula: 6.5 10.7273730684 61% => OK
gunning_fog: 9.6 10.498013245 91% => OK
text_standard: 13.0 11.2008830022 116% => OK
What are above readability scores?
---------------------
Rates: 75.0 out of 100
Scores by essay e-grader: 22.5 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.