three possible theories that could explain the extinction of the Steller's sea cow
The reading material mentions three possible theories that could explain the extinction of the Steller's sea cow, while the speaker refutes all of the theories, claiming that they all have problems.
Firstly, the writer asserts that the sea cows might be overhunted to extinction by native Siberian people, because the sea cows could be a good source of food for the people in harsh environment. The lecturer questions this weak argument, pointing out the fact that the population of Siberian people was quite small; therefore, they did not need to hunt a large number of the sea cows to survive.
Another important point made in the passage is that ecosystems disturbances might cause a drop in the sea cows' main source of food, kelp; therefore, the sea cows might starve to death. The professor does not think this theory hold water tightly. According to her, if there was a ecosystems disturbances, the decline of population was not only appearing in kelp. Other populations of mammal animals, like whales, might underwent a decline as well. However, the number of whales was never reported a decline during the time.
Finally, the author believes that European fur traders should be responsible for the sea cows' extinction. The professor casts doubts on this point. According to her, by the time European fur traders arrived, the population of the sea cows has already been quite small. Thus, other reasons might cause this serious reduction, not the European fur traders who were just the last one to arrive.
Grammar and spelling errors:
Line 1, column 140, Rule ID: ALL_OF_THE[1]
Message: Simply use 'all the'.
Suggestion: all the
...lers sea cow, while the speaker refutes all of the theories, claiming that they all have p...
^^^^^^^^^^
Line 3, column 355, Rule ID: LARGE_NUMBER_OF[1]
Message: Specify a number, remove phrase, or simply use 'many' or 'numerous'
Suggestion: many; numerous
...l; therefore, they did not need to hunt a large number of the sea cows to survive. Another im...
^^^^^^^^^^^^^^^^^
Line 5, column 278, Rule ID: EN_A_VS_AN
Message: Use 'an' instead of 'a' if the following word starts with a vowel sound, e.g. 'an article', 'an hour'
Suggestion: an
...tightly. According to her, if there was a ecosystems disturbances, the decline of...
^
Line 5, column 412, Rule ID: WHITESPACE_RULE
Message: Possible typo: you repeated a whitespace
Suggestion:
...ulations of mammal animals, like whales, might underwent a decline as well. Howev...
^^
Line 7, column 90, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'cows'' or 'cow's'?
Suggestion: cows'; cow's
...aders should be responsible for the sea cows extinction. The professor casts doubts ...
^^^^
Discourse Markers used:
['finally', 'first', 'firstly', 'however', 'if', 'so', 'therefore', 'thus', 'well', 'while']
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance in Part of Speech:
Nouns: 0.257042253521 0.261695866417 98% => OK
Verbs: 0.147887323944 0.158904122519 93% => OK
Adjectives: 0.080985915493 0.0723426182421 112% => OK
Adverbs: 0.0669014084507 0.0435111971325 154% => OK
Pronouns: 0.0140845070423 0.0277247811725 51% => OK
Prepositions: 0.102112676056 0.128828473217 79% => OK
Participles: 0.0316901408451 0.0370669169778 85% => OK
Conjunctions: 2.55881927057 2.5805825403 99% => OK
Infinitives: 0.0246478873239 0.0208969081088 118% => OK
Particles: 0.00352112676056 0.00154638098197 228% => OK
Determiners: 0.144366197183 0.128158765124 113% => OK
Modal_auxiliary: 0.0281690140845 0.0158828679856 177% => OK
WH_determiners: 0.00704225352113 0.0114777025283 61% => OK
Vocabulary words and sentences:
No of characters: 1522.0 1645.83664459 92% => OK
No of words: 252.0 271.125827815 93% => OK
Chars per words: 6.03968253968 6.08160592843 99% => OK
Fourth root words length: 3.98428260373 4.04852973271 98% => OK
words length more than 5 chars: 0.357142857143 0.374372842146 95% => OK
words length more than 6 chars: 0.277777777778 0.287516216867 97% => OK
words length more than 7 chars: 0.198412698413 0.187439937562 106% => OK
words length more than 8 chars: 0.111111111111 0.113142543107 98% => OK
Word Length SD: 2.55881927057 2.5805825403 99% => OK
Unique words: 141.0 145.348785872 97% => OK
Unique words percentage: 0.559523809524 0.539623497131 104% => OK
Word variations: 55.3727607972 53.8517498576 103% => OK
How many sentences: 12.0 13.0529801325 92% => OK
Sentence length: 21.0 21.7502111507 97% => OK
Sentence length SD: 54.0808936276 49.3711431718 110% => OK
Chars per sentence: 126.833333333 132.220823453 96% => OK
Words per sentence: 21.0 21.7502111507 97% => OK
Discourse Markers: 0.833333333333 0.878197800319 95% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 5.0 3.39072847682 147% => OK
Readability: 48.7777777778 50.5018328374 97% => OK
Elegance: 1.70769230769 1.90840788429 89% => OK
Coherence and Cohesion:
Essay topic to essay body coherence: 0.501178098751 0.549887131256 91% => OK
Sentence sentence coherence: 0.127387753577 0.142949733639 89% => OK
Sentence sentence coherence SD: 0.0863250735412 0.0787303798458 110% => OK
Sentence paragraph coherence: 0.627418293405 0.631733273073 99% => OK
Sentence paragraph coherence SD: 0.202133468145 0.139662658121 145% => OK
Sentence topic coherence: 0.217972265612 0.266732575781 82% => OK
Sentence topic coherence SD: 0.151851929426 0.103435571967 147% => OK
Paragraph paragraph coherence: 0.427920028071 0.414875509568 103% => OK
Paragraph paragraph coherence SD: 0.0368654690971 0.0530846634433 69% => OK
Paragraph topic coherence: 0.383453127473 0.40443939384 95% => OK
Paragraph topic coherence SD: 0.149064924761 0.0528353158467 282% => OK
Task Achievement:
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 4.26048565121 70% => OK
Positive topic words: 1.0 3.49668874172 29% => More positive topic words wanted.
Negative topic words: 5.0 3.62251655629 138% => OK
Neutral topic words: 3.0 3.1766004415 94% => OK
Total topic words: 9.0 10.2958057395 87% => OK
What are sentences with positive/Negative/neutral sentiment?
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Rates: 86.6666666667 out of 100
Scores by essay e-grader: 26.0 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.