The article discusses three theories about the main reason of the extinction of Steller's sea cow in Bering Island off the coast of Siberia. The professor indicates that even today scientists don't know the main cause of their extinction, and refutes each of the article's theories.
First, the article claims that sea cows might have been haunted in large numbers by native Siberian people. The professor states that this is highly unlikely, because sea cows are massive creatures. They are about nine meters long and they have at least ten tons of weight. He states that couple of sea cows could feed an entire village of native Siberians in a month. Thus, the Siberians didn't need that much of see cow hunting to provide their food.
Second, the article states that the sea cows might have become extinct because of ecosystems disruptions causing a decline of kelp population; a type of sea plant that is their main food resource. The professor disagrees and says that if there was a ecosystem diturbances in that time, it should have affected other types of animals experiencing food shortages; such as whales that are still present in that area. But there are no evidence or report of that phenomena on other animals; which means that this theory is out of order as well.
Finally, the article debates that it might have been Europeans fur traders who caused the extinction of sea cows; after they came to the island in 1741. The professor refuses this point as well and argues that when Europeans came to the island, the sea cows population were already declining from hundreds of years ago. Therefore, the main reason is still undetected and the European couldn't caused the sea cows extinction.
Grammar and spelling errors:
Line 1, column 192, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: don't
...or indicates that even today scientists dont know the main cause of their extinction...
^^^^
Line 3, column 390, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: didn't
...berians in a month. Thus, the Siberians didnt need that much of see cow hunting to pr...
^^^^^
Line 5, column 249, 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
...or disagrees and says that if there was a ecosystem diturbances in that time, it ...
^
Line 7, column 254, Rule ID: POSSESIVE_APOSTROPHE[1]
Message: Possible typo: apostrophe is missing. Did you mean 'cows'' or 'cow's'?
Suggestion: cows'; cow's
...n Europeans came to the island, the sea cows population were already declining from ...
^^^^
Line 7, column 385, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: couldn't
...on is still undetected and the European couldnt caused the sea cows extinction.
^^^^^^^
Line 7, column 408, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'cows'' or 'cow's'?
Suggestion: cows'; cow's
...and the European couldnt caused the sea cows extinction.
^^^^
Transition Words or Phrases used:
but, finally, first, if, second, so, still, therefore, thus, well, at least, such as
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 12.0 10.4613686534 115% => OK
Auxiliary verbs: 6.0 5.04856512141 119% => OK
Conjunction : 7.0 7.30242825607 96% => OK
Relative clauses : 18.0 12.0772626932 149% => OK
Pronoun: 27.0 22.412803532 120% => Less pronouns wanted
Preposition: 34.0 30.3222958057 112% => OK
Nominalization: 7.0 5.01324503311 140% => OK
Performance on vocabulary words:
No of characters: 1418.0 1373.03311258 103% => OK
No of words: 290.0 270.72406181 107% => OK
Chars per words: 4.88965517241 5.08290768461 96% => OK
Fourth root words length: 4.12666770723 4.04702891845 102% => OK
Word Length SD: 2.39491137114 2.5805825403 93% => OK
Unique words: 164.0 145.348785872 113% => OK
Unique words percentage: 0.565517241379 0.540411800872 105% => OK
syllable_count: 429.3 419.366225166 102% => 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
Article: 12.0 8.23620309051 146% => OK
Subordination: 2.0 1.25165562914 160% => OK
Conjunction: 2.0 1.51434878587 132% => OK
Preposition: 1.0 2.5761589404 39% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 13.0 13.0662251656 99% => OK
Sentence length: 22.0 21.2450331126 104% => OK
Sentence length SD: 42.3440403301 49.2860985944 86% => OK
Chars per sentence: 109.076923077 110.228320801 99% => OK
Words per sentence: 22.3076923077 21.698381199 103% => OK
Discourse Markers: 6.46153846154 7.06452816374 91% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 6.0 4.19205298013 143% => OK
Sentences with positive sentiment : 0.0 4.33554083885 0% => More positive sentences wanted.
Sentences with negative sentiment : 5.0 4.45695364238 112% => 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: 0.589609229948 0.272083759551 217% => OK
Sentence topic coherence: 0.212172026702 0.0996497079465 213% => Sentence topic similarity is high.
Sentence topic coherence SD: 0.12913253901 0.0662205650399 195% => OK
Paragraph topic coherence: 0.356893616472 0.162205337803 220% => OK
Paragraph topic coherence SD: 0.0765528870028 0.0443174109184 173% => OK
Essay readability:
automated_readability_index: 12.8 13.3589403974 96% => OK
flesch_reading_ease: 57.61 53.8541721854 107% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 10.7 11.0289183223 97% => OK
coleman_liau_index: 11.38 12.2367328918 93% => OK
dale_chall_readability_score: 8.48 8.42419426049 101% => OK
difficult_words: 69.0 63.6247240618 108% => OK
linsear_write_formula: 7.5 10.7273730684 70% => OK
gunning_fog: 10.8 10.498013245 103% => OK
text_standard: 11.0 11.2008830022 98% => OK
What are above readability scores?
---------------------
Rates: 70.0 out of 100
Scores by essay e-grader: 21.0 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.