In the reading passage, the author provides three theories regarding the extinction of sea cows. The lecturer, however, points out the problems of each assertion.
First, the author mentions that sea cows may have been overhunted by native Siberian which caused the extinction eventually. The lecturer rebuts this point, contending that sea cows were massive mammals; on the other hand, in contrast to the population of native Siberian, it was not quite large. In conclusion, a couple of sea cows could be enough to support native Siberian; thus, there was no need to overhunt sea cows.
Second, it is believed that ecosystems disturbances may have resulted in a decrease of sea cow's main food source, kelps, which may have contributed to their extinction. This is countered by the lecturer again. The lecturer points out that if the ecosystem disturbances did occur around the island, other mammals would have been affected too. Nevertheless, there is no evidence indicates that other mammals such as whales had declined. Hence, sea cows never had encountered the shortage of food.
Third, the extinction is also attributed to the European fur traders by the author. The lecturer refutes this view, suggesting that by the time the European fur traders came to the island, the population of sea cows was already small. Furthermore, he asserts that sea cow population has begun to decline hundreds of years ago. Therefore, it is something else responsible for the extinction of sea cows.
Transition Words or Phrases used:
also, but, first, furthermore, hence, however, if, may, nevertheless, regarding, second, so, therefore, third, thus, in conclusion, in contrast, such as, in contrast to, on the other hand
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 : 0.0 7.30242825607 0% => More conjunction wanted.
Relative clauses : 9.0 12.0772626932 75% => More relative clauses wanted.
Pronoun: 15.0 22.412803532 67% => OK
Preposition: 29.0 30.3222958057 96% => OK
Nominalization: 10.0 5.01324503311 199% => OK
Performance on vocabulary words:
No of characters: 1256.0 1373.03311258 91% => OK
No of words: 242.0 270.72406181 89% => More content wanted.
Chars per words: 5.19008264463 5.08290768461 102% => OK
Fourth root words length: 3.94415379849 4.04702891845 97% => OK
Word Length SD: 2.74973221464 2.5805825403 107% => OK
Unique words: 135.0 145.348785872 93% => More unique words wanted.
Unique words percentage: 0.557851239669 0.540411800872 103% => OK
syllable_count: 379.8 419.366225166 91% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 5.0 3.25607064018 154% => OK
Article: 9.0 8.23620309051 109% => OK
Subordination: 0.0 1.25165562914 0% => More adverbial clause wanted.
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 4.0 2.5761589404 155% => OK
Performance on sentences:
How many sentences: 14.0 13.0662251656 107% => OK
Sentence length: 17.0 21.2450331126 80% => The Avg. Sentence Length is relatively short.
Sentence length SD: 39.2410135299 49.2860985944 80% => OK
Chars per sentence: 89.7142857143 110.228320801 81% => OK
Words per sentence: 17.2857142857 21.698381199 80% => OK
Discourse Markers: 13.3571428571 7.06452816374 189% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 0.0 4.19205298013 0% => OK
Sentences with positive sentiment : 3.0 4.33554083885 69% => OK
Sentences with negative sentiment : 5.0 4.45695364238 112% => OK
Sentences with neutral sentiment: 6.0 4.27373068433 140% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.546011766393 0.272083759551 201% => OK
Sentence topic coherence: 0.17800965439 0.0996497079465 179% => OK
Sentence topic coherence SD: 0.117001234071 0.0662205650399 177% => OK
Paragraph topic coherence: 0.305663622815 0.162205337803 188% => OK
Paragraph topic coherence SD: 0.122870204133 0.0443174109184 277% => More connections among paragraphs wanted.
Essay readability:
automated_readability_index: 11.7 13.3589403974 88% => Automated_readability_index is low.
flesch_reading_ease: 54.22 53.8541721854 101% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 9.9 11.0289183223 90% => OK
coleman_liau_index: 12.53 12.2367328918 102% => OK
dale_chall_readability_score: 8.59 8.42419426049 102% => OK
difficult_words: 63.0 63.6247240618 99% => OK
linsear_write_formula: 8.0 10.7273730684 75% => OK
gunning_fog: 8.8 10.498013245 84% => OK
text_standard: 9.0 11.2008830022 80% => OK
What are above readability scores?
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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.