the reasons why sea cows became extinct
Both the reading and the lecture are discussing extinct marine mammals named Steller's sea cows. The reading suggests three reasons why these animals became extinct. However, the professor asserts that none of the reasons are valid and there are problems with each argument.
To begin with, The author claims that native people might have diminished the number of sea cows by overhunting them. However, the professor refutes this point by arguing that sea cows were massive creatures. They were up to 9 meters high and weighed up to 20 tons. As a result, one of these enormous animals could feed a whole Syberian tribe for a month. While Syberian tribes were not that much big, they did not need to hunt many of the sea cows. As a result, this could not be the main reason for the sea cows' extinction.
Furthermore, the reading passage states that because of ecosystems disturbances, Kelp, which was the main source of food for sea cows, diminished in number. Consequently, the number of sea cows declined. In contrast, this argument is challenged by the professor's position that if any severe disturbances had happened that time, not only the Kelpt but also other marine animals like whales would have faced population decline. But, there is no report of whale declines. Therefore, It is logical to assume that Kelpt's growing was fine and the cause of the sea cows' extinction was something else.
Finally, the last point of the reading suggests that since the European fur traders caught the last sea cow, it is reasonable to think that the European arrival to the island was the main cause of extinction. Nevertheless, the professor casts doubt on this reason by explaining that it seems that the sea cows had been extinct before the arrival of the European. Studies have shown that the population of the sea cows was at its largest amount 1000 years before the time that the European first entered the island. Thus, this could not be the main cause of the extinction and the main cause, whatever it is, it should be considered as the main reason.
Grammar and spelling errors:
Line 2, column 509, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'cows'' or 'cow's'?
Suggestion: cows'; cow's
...ould not be the main reason for the sea cows extinction. Furthermore, the reading p...
^^^^
Transition Words or Phrases used:
also, but, consequently, finally, first, furthermore, however, if, nevertheless, so, therefore, thus, while, in contrast, as a result, to begin with
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 20.0 10.4613686534 191% => OK
Auxiliary verbs: 7.0 5.04856512141 139% => OK
Conjunction : 6.0 7.30242825607 82% => OK
Relative clauses : 15.0 12.0772626932 124% => OK
Pronoun: 30.0 22.412803532 134% => Less pronouns wanted
Preposition: 37.0 30.3222958057 122% => OK
Nominalization: 9.0 5.01324503311 180% => OK
Performance on vocabulary words:
No of characters: 1699.0 1373.03311258 124% => OK
No of words: 353.0 270.72406181 130% => OK
Chars per words: 4.81303116147 5.08290768461 95% => OK
Fourth root words length: 4.33454660006 4.04702891845 107% => OK
Word Length SD: 2.4606330789 2.5805825403 95% => OK
Unique words: 185.0 145.348785872 127% => OK
Unique words percentage: 0.524079320113 0.540411800872 97% => OK
syllable_count: 515.7 419.366225166 123% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 8.0 3.25607064018 246% => Less pronouns wanted as sentence beginning.
Article: 8.0 8.23620309051 97% => OK
Subordination: 3.0 1.25165562914 240% => Less adverbial clause wanted.
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 2.0 2.5761589404 78% => OK
Performance on sentences:
How many sentences: 18.0 13.0662251656 138% => OK
Sentence length: 19.0 21.2450331126 89% => OK
Sentence length SD: 49.6364561364 49.2860985944 101% => OK
Chars per sentence: 94.3888888889 110.228320801 86% => OK
Words per sentence: 19.6111111111 21.698381199 90% => OK
Discourse Markers: 8.22222222222 7.06452816374 116% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 1.0 4.19205298013 24% => 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: 9.0 4.27373068433 211% => Less facts, knowledge or examples wanted.
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.400536291685 0.272083759551 147% => OK
Sentence topic coherence: 0.124847095738 0.0996497079465 125% => OK
Sentence topic coherence SD: 0.103293225628 0.0662205650399 156% => OK
Paragraph topic coherence: 0.237722503683 0.162205337803 147% => OK
Paragraph topic coherence SD: 0.0689037190023 0.0443174109184 155% => OK
Essay readability:
automated_readability_index: 11.0 13.3589403974 82% => Automated_readability_index is low.
flesch_reading_ease: 60.65 53.8541721854 113% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 9.5 11.0289183223 86% => OK
coleman_liau_index: 10.62 12.2367328918 87% => OK
dale_chall_readability_score: 7.84 8.42419426049 93% => OK
difficult_words: 73.0 63.6247240618 115% => OK
linsear_write_formula: 6.5 10.7273730684 61% => OK
gunning_fog: 9.6 10.498013245 91% => OK
text_standard: 11.0 11.2008830022 98% => OK
What are above readability scores?
---------------------
Write the essay in 20 minutes.
Rates: 76.6666666667 out of 100
Scores by essay e-grader: 23.0 Out of 30
---------------------
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.