The reading passage provides three theories to explain the main cause of the sea cows’ extinction. The professor, however, refutes all the author's reasons and says there are problems with each theory and the main cause is still unknown.
First, the author posits that some people of native Siberian used to hunt the sea cow for food; therefore, they could be the main cause for this animal to be disappeared. Conversely, the professor argues that sea cows were massive and weight more than ten tons; thus, it is not possible that Siberian small population would hunt all the sea cows in order to eat them.
Second, the reading passage mentions that ecosystems disturbances cause a decline in sea kelp, which is the main source of food of the sea cow; therefore, food scarcity would cause the sea cows vanished. The professor contends this theory by stating that if ecosystem disturbances theory is accurate it would affect other lives of the marine not only the sea cows. For instance, it was proven that other animals such as whales that feed on sea plant same as sea cows had no indication to be endangered. Thus, this theory is not plausible to be believed.
Last, the author states that European fur traders who came to the island are feasible to be believed they were the cause of the sea cows’ disappearance because of their evidence of hunting this animal. The professor casts doubt on this reason and says that European fur traders arrived in the island while the sea cows’ population already small. Therefore, it is impossible they were the main cause of extinction. It must be something seriously happened before they came other than their hunting.
All in all, according to the listening, all the reading theories of sea cows’ extinction are not reliable, and the main cause is still mysterious.
Transition Words or Phrases used:
conversely, first, however, if, second, so, still, therefore, thus, while, for instance, such as
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 20.0 10.4613686534 191% => OK
Auxiliary verbs: 5.0 5.04856512141 99% => OK
Conjunction : 5.0 7.30242825607 68% => OK
Relative clauses : 11.0 12.0772626932 91% => OK
Pronoun: 26.0 22.412803532 116% => OK
Preposition: 28.0 30.3222958057 92% => OK
Nominalization: 8.0 5.01324503311 160% => OK
Performance on vocabulary words:
No of characters: 1532.0 1373.03311258 112% => OK
No of words: 309.0 270.72406181 114% => OK
Chars per words: 4.95792880259 5.08290768461 98% => OK
Fourth root words length: 4.1926597562 4.04702891845 104% => OK
Word Length SD: 2.55672852229 2.5805825403 99% => OK
Unique words: 151.0 145.348785872 104% => OK
Unique words percentage: 0.488673139159 0.540411800872 90% => More unique words wanted or less content wanted.
syllable_count: 464.4 419.366225166 111% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 6.0 3.25607064018 184% => OK
Article: 8.0 8.23620309051 97% => OK
Subordination: 0.0 1.25165562914 0% => More adverbial clause wanted.
Conjunction: 1.0 1.51434878587 66% => 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: 23.0 21.2450331126 108% => OK
Sentence length SD: 48.9256167701 49.2860985944 99% => OK
Chars per sentence: 117.846153846 110.228320801 107% => OK
Words per sentence: 23.7692307692 21.698381199 110% => OK
Discourse Markers: 7.38461538462 7.06452816374 105% => OK
Paragraphs: 5.0 4.09492273731 122% => OK
Language errors: 0.0 4.19205298013 0% => OK
Sentences with positive sentiment : 0.0 4.33554083885 0% => More positive sentences wanted.
Sentences with negative sentiment : 8.0 4.45695364238 179% => 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: 0.520806955802 0.272083759551 191% => OK
Sentence topic coherence: 0.206040126457 0.0996497079465 207% => Sentence topic similarity is high.
Sentence topic coherence SD: 0.112048353108 0.0662205650399 169% => OK
Paragraph topic coherence: 0.312192893882 0.162205337803 192% => OK
Paragraph topic coherence SD: 0.0721595559066 0.0443174109184 163% => OK
Essay readability:
automated_readability_index: 13.8 13.3589403974 103% => OK
flesch_reading_ease: 56.59 53.8541721854 105% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 11.1 11.0289183223 101% => OK
coleman_liau_index: 11.78 12.2367328918 96% => OK
dale_chall_readability_score: 7.95 8.42419426049 94% => OK
difficult_words: 62.0 63.6247240618 97% => OK
linsear_write_formula: 13.5 10.7273730684 126% => OK
gunning_fog: 11.2 10.498013245 107% => OK
text_standard: 14.0 11.2008830022 125% => OK
What are above readability scores?
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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.