The huge marine mammal known as Steller's sea cow, first found by Georg W. Steller in 1741, became extinct in 1768, and the reasons for this are not clear. Three reasons are known as possible explanation for the extinction of the sea cow but they appear flawed.
First reason given for extinction, the 'over-hunting' of these cows for food, by the Siberian people native to the area can be refuted by the facts that sea cows were very large mammals. They weigh around 10 tonnes and were about 9 meters long. So for the small Siberian population hunting only a few of these sea cows would have brought enough food to feed upon for several months. Therefore, it can be concluded that Siberian people may not have been responsible for the sea cow's extinction. Which brings us to the next reason, the decline in the source of food of these mammals.
The change in ecosystem resulting in less amount of kelp, the second possible reason for the extinction of these cows, can also be undermined by the fact that if the availability of kelp, on which these large sea mammals fed, was declining other sea mammals like whale would have also suffered. But, as facts explain the number of whales was no declining and therefore, it can be implied that the sea cows were not killed by the shortage of food. This points us to the next reason, hunting by European traders.
Lastly, fur traders from Europe who came to the island after 1741 and were armed with weapons are suspected to be the cause for demise of the sea cows. However, when the European traders arrived they noted that the number of these animals was already too short. This exculpates the European fur traders from the blame of excessively hunting these mammals. The extinction of sea cows would have began around hundred years before the arrival of these traders.
Conclusively it can be said that the reason for the extinction of the sea cow is not clearly known and the given possible explanations lack credibility. Therefore it can be concluded that none of the given reasons are accurate enough to determine the cause that led to extinction of the Steller's sea cows
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Grammar and spelling errors:
Line 3, column 476, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'cows'' or 'cow's'?
Suggestion: cows'; cow's
...y not have been responsible for the sea cows extinction. Which brings us to the next...
^^^^
Line 7, column 395, Rule ID: HAVE_PART_AGREEMENT[1]
Message: Use past participle here: 'begun'.
Suggestion: begun
.... The extinction of sea cows would have began around hundred years before the arrival...
^^^^^
Line 9, column 154, Rule ID: SENT_START_CONJUNCTIVE_LINKING_ADVERB_COMMA[1]
Message: Did you forget a comma after a conjunctive/linking adverb?
Suggestion: Therefore,
...possible explanations lack credibility. Therefore it can be concluded that none of the gi...
^^^^^^^^^
Transition Words or Phrases used:
also, but, first, however, if, lastly, may, second, so, therefore
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 20.0 10.4613686534 191% => OK
Auxiliary verbs: 10.0 5.04856512141 198% => OK
Conjunction : 6.0 7.30242825607 82% => OK
Relative clauses : 12.0 12.0772626932 99% => OK
Pronoun: 28.0 22.412803532 125% => Less pronouns wanted
Preposition: 49.0 30.3222958057 162% => OK
Nominalization: 9.0 5.01324503311 180% => OK
Performance on vocabulary words:
No of characters: 1758.0 1373.03311258 128% => OK
No of words: 373.0 270.72406181 138% => Less content wanted.
Chars per words: 4.71313672922 5.08290768461 93% => OK
Fourth root words length: 4.39467950092 4.04702891845 109% => OK
Word Length SD: 2.38316238315 2.5805825403 92% => OK
Unique words: 175.0 145.348785872 120% => OK
Unique words percentage: 0.469168900804 0.540411800872 87% => More unique words wanted or less content wanted.
syllable_count: 535.5 419.366225166 128% => OK
avg_syllables_per_word: 1.4 1.55342163355 90% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 5.0 3.25607064018 154% => OK
Interrogative: 1.0 0.116997792494 855% => Less interrogative sentences wanted.
Article: 6.0 8.23620309051 73% => OK
Subordination: 2.0 1.25165562914 160% => OK
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 2.0 2.5761589404 78% => OK
Performance on sentences:
How many sentences: 17.0 13.0662251656 130% => OK
Sentence length: 21.0 21.2450331126 99% => OK
Sentence length SD: 55.3183926689 49.2860985944 112% => OK
Chars per sentence: 103.411764706 110.228320801 94% => OK
Words per sentence: 21.9411764706 21.698381199 101% => OK
Discourse Markers: 3.82352941176 7.06452816374 54% => More transition words/phrases wanted.
Paragraphs: 5.0 4.09492273731 122% => OK
Language errors: 3.0 4.19205298013 72% => OK
Sentences with positive sentiment : 3.0 4.33554083885 69% => OK
Sentences with negative sentiment : 6.0 4.45695364238 135% => 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: 0.506970534698 0.272083759551 186% => OK
Sentence topic coherence: 0.187182340819 0.0996497079465 188% => OK
Sentence topic coherence SD: 0.0869631341553 0.0662205650399 131% => OK
Paragraph topic coherence: 0.31224185066 0.162205337803 192% => OK
Paragraph topic coherence SD: 0.0365883146059 0.0443174109184 83% => OK
Essay readability:
automated_readability_index: 11.7 13.3589403974 88% => Automated_readability_index is low.
flesch_reading_ease: 67.08 53.8541721854 125% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 9.1 11.0289183223 83% => OK
coleman_liau_index: 10.04 12.2367328918 82% => OK
dale_chall_readability_score: 7.18 8.42419426049 85% => OK
difficult_words: 59.0 63.6247240618 93% => OK
linsear_write_formula: 8.0 10.7273730684 75% => OK
gunning_fog: 10.4 10.498013245 99% => OK
text_standard: 8.0 11.2008830022 71% => OK
What are above readability scores?
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Write the essay in 20 minutes.
Rates: 73.3333333333 out of 100
Scores by essay e-grader: 22.0 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.