The reading passage discusses an interesting topic about the extinction of the Steller's sea cow, a huge marine mammal who lived around Bering Island, and provides three reason with extensive information of support for why this extinction happened. However, the lecturer casts doubts to all of the reasons giving by the reading passage. He believes nobody knows for sure why this huge mammal disappeared.
First of all, the reading passage argues that one motive for the extinction of the sea cow could be its overhunting by Siberian natives. On the contrary, the lecturer states that the size of the mammal was bigger enough to feed a couple of small villages. In consequence, no need of big hunting would be necessary to feed the small native population and thus, this claim can not explain the disappearing of the sea cow.
Secondly, the reading passage explains how the kelp population decline due to ecosystems changes. Therefore, the population of the sea cow declined too because the kelps were its main source of food, according to the reading passage. The lecture opposes to this claim by sustain that a ecosystem disturbance would affected other species like whales, that have same sources of food, and not only the sea cows.
Finally, the reading passage claims that other main cause of the extinction of the sea cow could have been the action of European fur traders, who arrived to the island by 1741. Challenging this idea, the lecturer refutes the reading passage explaining that by the time European fur traders arrived, the population of the sea cow was already very low. Thus, something else was the real cause of its extinction and should have started many years before any European steps on the Being Island to hunt them.
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Grammar and spelling errors:
Line 1, column 287, Rule ID: ALL_OF_THE[1]
Message: Simply use 'all the'.
Suggestion: all the
.... However, the lecturer casts doubts to all of the reasons giving by the reading passage. ...
^^^^^^^^^^
Line 5, column 285, 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
...e opposes to this claim by sustain that a ecosystem disturbance would affected ot...
^
Line 5, column 315, Rule ID: DID_BASEFORM[1]
Message: The verb 'would' requires the base form of the verb: 'affect'
Suggestion: affect
...tain that a ecosystem disturbance would affected other species like whales, that have sa...
^^^^^^^^
Transition Words or Phrases used:
finally, first, however, second, secondly, so, therefore, thus, first of all, on the contrary
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 8.0 10.4613686534 76% => OK
Auxiliary verbs: 7.0 5.04856512141 139% => OK
Conjunction : 4.0 7.30242825607 55% => More conjunction wanted.
Relative clauses : 8.0 12.0772626932 66% => More relative clauses wanted.
Pronoun: 16.0 22.412803532 71% => OK
Preposition: 38.0 30.3222958057 125% => OK
Nominalization: 12.0 5.01324503311 239% => Less nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1457.0 1373.03311258 106% => OK
No of words: 293.0 270.72406181 108% => OK
Chars per words: 4.97269624573 5.08290768461 98% => OK
Fourth root words length: 4.13729897018 4.04702891845 102% => OK
Word Length SD: 2.51455477321 2.5805825403 97% => OK
Unique words: 158.0 145.348785872 109% => OK
Unique words percentage: 0.539249146758 0.540411800872 100% => OK
syllable_count: 449.1 419.366225166 107% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 3.0 3.25607064018 92% => OK
Interrogative: 1.0 0.116997792494 855% => Less interrogative sentences wanted.
Article: 11.0 8.23620309051 134% => 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: 12.0 13.0662251656 92% => OK
Sentence length: 24.0 21.2450331126 113% => OK
Sentence length SD: 46.6115746236 49.2860985944 95% => OK
Chars per sentence: 121.416666667 110.228320801 110% => OK
Words per sentence: 24.4166666667 21.698381199 113% => OK
Discourse Markers: 7.75 7.06452816374 110% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 3.0 4.19205298013 72% => OK
Sentences with positive sentiment : 3.0 4.33554083885 69% => OK
Sentences with negative sentiment : 4.0 4.45695364238 90% => OK
Sentences with neutral sentiment: 5.0 4.27373068433 117% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.467516460374 0.272083759551 172% => OK
Sentence topic coherence: 0.169866064699 0.0996497079465 170% => OK
Sentence topic coherence SD: 0.116029522213 0.0662205650399 175% => OK
Paragraph topic coherence: 0.283528874486 0.162205337803 175% => OK
Paragraph topic coherence SD: 0.0891976788178 0.0443174109184 201% => More connections among paragraphs wanted.
Essay readability:
automated_readability_index: 14.2 13.3589403974 106% => OK
flesch_reading_ease: 55.58 53.8541721854 103% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 11.5 11.0289183223 104% => OK
coleman_liau_index: 11.84 12.2367328918 97% => OK
dale_chall_readability_score: 8.33 8.42419426049 99% => OK
difficult_words: 65.0 63.6247240618 102% => OK
linsear_write_formula: 11.0 10.7273730684 103% => OK
gunning_fog: 11.6 10.498013245 110% => OK
text_standard: 12.0 11.2008830022 107% => OK
What are above readability scores?
---------------------
Rates: 80.0 out of 100
Scores by essay e-grader: 24.0 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.