Both the reading and the lecture discuss three theories about the main causes of Steller's sea cow extinction. While the author claims that these theories contribute to the main causes of this event, the professor disagrees and provides some pieces of evidence to state that these theories would not be the major reason of this phenomenon.
First, the reading says that over hunting of the sea cows by native Siberian people could be the key factor of the extinction of this animal. However, the lecturer disagrees. According to the lecturer, each sea cow was so big so that it could supply enough food resource for the whole village for a long period of time, so it was necessary for the residents to kill a large number of this animal to gain sufficient food supply.
Second, according to the reading passage, some ecosystem changes occurred near Beriling Island which resulted in the reduction of kelp, which was the main food of sea cow. As a result, sea cows encountered with the deficient food supply and subsequently their population decreased because of lack of food. Again, the lecturer disproves this point. He points out that if that change in environment was too severe that it could led to the destruction of kelp plant, we must have other evidences of the extinction of other marine animals such as whales. However, there is not any evidence of such extinction; therefore, this hypothesis is not credited either.
Third, the reading passage points out that the sea cows might be haunted by fur traders in order to obtain their fur. It refers to the chronological evidences that shows that the number of sea cows gradually diminished after the settlement of these trader. Conversely, the professor rejects this hypothesis and he argues that it seems that something caused the reduction of sea cows long before the time when fur traders inhabit on the island because there are some evidences that indicate that there was a small number of sea cows remained when the traders first came to the island.
Grammar and spelling errors:
Line 3, column 305, Rule ID: PERIOD_OF_TIME[1]
Message: Use simply 'period'.
Suggestion: period
...source for the whole village for a long period of time, so it was necessary for the residents ...
^^^^^^^^^^^^^^
Line 3, column 367, Rule ID: LARGE_NUMBER_OF[1]
Message: Specify a number, remove phrase, or simply use 'many' or 'numerous'
Suggestion: many; numerous
...was necessary for the residents to kill a large number of this animal to gain sufficient food sup...
^^^^^^^^^^^^^^^^^
Line 5, column 427, Rule ID: DID_BASEFORM[1]
Message: The verb 'could' requires the base form of the verb: 'lead'
Suggestion: lead
...nvironment was too severe that it could led to the destruction of kelp plant, we mu...
^^^
Line 7, column 506, Rule ID: SMALL_NUMBER_OF[1]
Message: Specify a number, remove phrase, use 'a few', or use 'some'
Suggestion: a few; some
... evidences that indicate that there was a small number of sea cows remained when the traders firs...
^^^^^^^^^^^^^^^^^
Discourse Markers used:
['but', 'conversely', 'first', 'however', 'if', 'second', 'so', 'therefore', 'third', 'while', 'as to', 'such as', 'as a result']
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance in Part of Speech:
Nouns: 0.293800539084 0.261695866417 112% => OK
Verbs: 0.121293800539 0.158904122519 76% => OK
Adjectives: 0.0619946091644 0.0723426182421 86% => OK
Adverbs: 0.0377358490566 0.0435111971325 87% => OK
Pronouns: 0.0269541778976 0.0277247811725 97% => OK
Prepositions: 0.148247978437 0.128828473217 115% => OK
Participles: 0.0161725067385 0.0370669169778 44% => Some participles wanted.
Conjunctions: 2.51564646528 2.5805825403 97% => OK
Infinitives: 0.0269541778976 0.0208969081088 129% => OK
Particles: 0.00539083557951 0.00154638098197 349% => OK
Determiners: 0.145552560647 0.128158765124 114% => OK
Modal_auxiliary: 0.0161725067385 0.0158828679856 102% => OK
WH_determiners: 0.0161725067385 0.0114777025283 141% => OK
Vocabulary words and sentences:
No of characters: 2019.0 1645.83664459 123% => OK
No of words: 342.0 271.125827815 126% => OK
Chars per words: 5.90350877193 6.08160592843 97% => OK
Fourth root words length: 4.30037696126 4.04852973271 106% => OK
words length more than 5 chars: 0.353801169591 0.374372842146 95% => OK
words length more than 6 chars: 0.251461988304 0.287516216867 87% => OK
words length more than 7 chars: 0.172514619883 0.187439937562 92% => OK
words length more than 8 chars: 0.114035087719 0.113142543107 101% => OK
Word Length SD: 2.51564646528 2.5805825403 97% => OK
Unique words: 175.0 145.348785872 120% => OK
Unique words percentage: 0.511695906433 0.539623497131 95% => More unique words wanted or less content wanted.
Word variations: 53.6761394011 53.8517498576 100% => OK
How many sentences: 13.0 13.0529801325 100% => OK
Sentence length: 26.3076923077 21.7502111507 121% => OK
Sentence length SD: 79.5473138951 49.3711431718 161% => OK
Chars per sentence: 155.307692308 132.220823453 117% => OK
Words per sentence: 26.3076923077 21.7502111507 121% => OK
Discourse Markers: 1.0 0.878197800319 114% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 4.0 3.39072847682 118% => OK
Readability: 51.4538911381 50.5018328374 102% => OK
Elegance: 2.46376811594 1.90840788429 129% => OK
Coherence and Cohesion:
Essay topic to essay body coherence: 0.779218788863 0.549887131256 142% => OK
Sentence sentence coherence: 0.135776745573 0.142949733639 95% => OK
Sentence sentence coherence SD: 0.10102277871 0.0787303798458 128% => OK
Sentence paragraph coherence: 0.621578349002 0.631733273073 98% => OK
Sentence paragraph coherence SD: 0.200330237908 0.139662658121 143% => OK
Sentence topic coherence: 0.387436572163 0.266732575781 145% => OK
Sentence topic coherence SD: 0.151166773523 0.103435571967 146% => OK
Paragraph paragraph coherence: 0.484144654016 0.414875509568 117% => OK
Paragraph paragraph coherence SD: 0.0240297902574 0.0530846634433 45% => OK
Paragraph topic coherence: 0.603148744466 0.40443939384 149% => OK
Paragraph topic coherence SD: 0.0422996588056 0.0528353158467 80% => OK
Task Achievement:
Sentences with positive sentiment : 1.0 4.33554083885 23% => More positive sentences wanted.
Sentences with negative sentiment : 8.0 4.45695364238 179% => OK
Sentences with neutral sentiment: 4.0 4.26048565121 94% => OK
Positive topic words: 1.0 3.49668874172 29% => More positive topic words wanted.
Negative topic words: 7.0 3.62251655629 193% => OK
Neutral topic words: 4.0 3.1766004415 126% => OK
Total topic words: 12.0 10.2958057395 117% => OK
What are sentences with positive/Negative/neutral sentiment?
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Rates: 80.0 out of 100
Scores by essay e-grader: 24.0 Out of 30
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Note: This is not the final score. 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.