The reading passage states threes theories may help to explain the extinction of Steller's sea cow, whereas the professor points out that these explanation are not reasonable.
Firstly, the author insists that sea cow was a good source of food for Siberian, and the overhunting of Siberian cause the extinction of sea cow. The professor, however, argues that sea cow was a massive creature and one of sea cow could feed the whole Siberian tribe for a month, meanwhile the population of Siberian was not so large that can cause the extinction of sea cow.
Secondly, the reading says that a ecosystem disturbance that lead to the decline of kelp population which is the main source of food of sea cow is responsible for the extinction. In contrast, the speaker reckons that if there was such a event, then other animals living in that time would also be influenced such as, whales. Nonetheless, there are no reports that whale's population had decreased. In this way, the ecosystem should be in a good condition.
Lastly, reading states that European fur traders who possessed weapons may account for the extinction of sea cow. On the contrary, the speaker deems that European fur traders are not the main reason why sea cow became extinct. There are evidences that the numbers of sea cow already had reduced before the European arrived, and when the European arrived, sea cow only had a small population. So it is other things that responsible for their extinction.
Grammar and spelling errors:
Line 1, column 138, Rule ID: THIS_NNS[2]
Message: Did you mean 'this explanation' or 'these explanations'?
Suggestion: this explanation; these explanations
..., whereas the professor points out that these explanation are not reasonable. Firstly, the aut...
^^^^^^^^^^^^^^^^^
Line 5, column 33, 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
...cow. Secondly, the reading says that a ecosystem disturbance that lead to the ...
^
Line 5, column 236, 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
... speaker reckons that if there was such a event, then other animals living in tha...
^
Transition Words or Phrases used:
also, first, firstly, however, if, lastly, may, nonetheless, second, secondly, so, then, whereas, while, in contrast, such as, on the contrary
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 13.0 10.4613686534 124% => OK
Auxiliary verbs: 6.0 5.04856512141 119% => OK
Conjunction : 3.0 7.30242825607 41% => More conjunction wanted.
Relative clauses : 16.0 12.0772626932 132% => OK
Pronoun: 17.0 22.412803532 76% => OK
Preposition: 21.0 30.3222958057 69% => OK
Nominalization: 13.0 5.01324503311 259% => Less nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1223.0 1373.03311258 89% => OK
No of words: 249.0 270.72406181 92% => More content wanted.
Chars per words: 4.91164658635 5.08290768461 97% => OK
Fourth root words length: 3.97237131171 4.04702891845 98% => OK
Word Length SD: 2.65057198473 2.5805825403 103% => OK
Unique words: 126.0 145.348785872 87% => More unique words wanted.
Unique words percentage: 0.506024096386 0.540411800872 94% => More unique words wanted or less content wanted.
syllable_count: 370.8 419.366225166 88% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 0.0 3.25607064018 0% => OK
Article: 7.0 8.23620309051 85% => OK
Subordination: 0.0 1.25165562914 0% => More adverbial clause wanted.
Conjunction: 2.0 1.51434878587 132% => OK
Preposition: 3.0 2.5761589404 116% => OK
Performance on sentences:
How many sentences: 11.0 13.0662251656 84% => Need more sentences. Double check the format of sentences, make sure there is a space between two sentences, or have enough periods. And also check the lengths of sentences, maybe they are too long.
Sentence length: 22.0 21.2450331126 104% => OK
Sentence length SD: 52.3416936348 49.2860985944 106% => OK
Chars per sentence: 111.181818182 110.228320801 101% => OK
Words per sentence: 22.6363636364 21.698381199 104% => OK
Discourse Markers: 12.9090909091 7.06452816374 183% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 3.0 4.19205298013 72% => OK
Sentences with positive sentiment : 4.0 4.33554083885 92% => OK
Sentences with negative sentiment : 4.0 4.45695364238 90% => 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: 0.557140633197 0.272083759551 205% => OK
Sentence topic coherence: 0.214104359268 0.0996497079465 215% => Sentence topic similarity is high.
Sentence topic coherence SD: 0.146706016136 0.0662205650399 222% => The coherence between sentences is low.
Paragraph topic coherence: 0.320124532738 0.162205337803 197% => OK
Paragraph topic coherence SD: 0.125633001191 0.0443174109184 283% => More connections among paragraphs wanted.
Essay readability:
automated_readability_index: 13.0 13.3589403974 97% => OK
flesch_reading_ease: 57.61 53.8541721854 107% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 10.7 11.0289183223 97% => OK
coleman_liau_index: 11.49 12.2367328918 94% => OK
dale_chall_readability_score: 7.9 8.42419426049 94% => OK
difficult_words: 50.0 63.6247240618 79% => More difficult words wanted.
linsear_write_formula: 14.0 10.7273730684 131% => OK
gunning_fog: 10.8 10.498013245 103% => OK
text_standard: 11.0 11.2008830022 98% => OK
What are above readability scores?
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Rates: 76.6666666667 out of 100
Scores by essay e-grader: 23.0 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.