Based on the reading material, it is stated that there are 3 viable hypotheses regarding why Steller's sea cows became extinct in the 1768. However, the lecturer finds this idea bereft of sufficient reasoning and presents some ideas to the contrary.
Initially, the author argued that sea cows may have been extincted due to overhunting by Siberian people, who hunted these animals owing to the fact that they were a good source of food. That being said, the lecturer repudiated this idea by clarifying that Steller's sea cow was among of huge animals. They were massive with hundreds of tons. A couple of them were enough for Siberian people to catch food in harsh environment and as a result, there was no need to overhunting. So, overhunting is not the cause of extinction.
Another reason mentioned by the author was that these animals were extincted because of ecosystems disturbances, which caused a decline in kelp population that was the source of food for sea cows. However, the lecturer rejected this one too by stating that if ecosystems disturbances were the cause of decline in kelp population, other marine animals like whales became extinct too owing to the fact that these animals are relied on kelp either. However, there is no record for extinction of whales in 1768. Hence, ecosystems disturbances are not the reason of extinction.
The final point advanced in the reading passage was that sea cows became extinct, because the European fur traders came to the island after 1741 and caught the last sea cow for its fur in 1768. Yet again, the professor casted doubt on this idea. He said that the population of sea cows was quite small before 1700s. These creatures may have been extincted long before the first European fur traders came to the island. Thus, the European are not blame for the extinction and there must be another reason for why these animals became extinct in 1768.
Transition Words or Phrases used:
first, hence, however, if, may, regarding, so, thus, as to, as a result
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 22.0 10.4613686534 210% => Less to be verbs wanted.
Auxiliary verbs: 4.0 5.04856512141 79% => OK
Conjunction : 5.0 7.30242825607 68% => OK
Relative clauses : 13.0 12.0772626932 108% => OK
Pronoun: 26.0 22.412803532 116% => OK
Preposition: 42.0 30.3222958057 139% => OK
Nominalization: 8.0 5.01324503311 160% => OK
Performance on vocabulary words:
No of characters: 1579.0 1373.03311258 115% => OK
No of words: 324.0 270.72406181 120% => OK
Chars per words: 4.87345679012 5.08290768461 96% => OK
Fourth root words length: 4.24264068712 4.04702891845 105% => OK
Word Length SD: 2.4908363529 2.5805825403 97% => OK
Unique words: 156.0 145.348785872 107% => OK
Unique words percentage: 0.481481481481 0.540411800872 89% => More unique words wanted or less content wanted.
syllable_count: 492.3 419.366225166 117% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 5.0 3.25607064018 154% => OK
Article: 8.0 8.23620309051 97% => OK
Subordination: 1.0 1.25165562914 80% => OK
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 0.0 2.5761589404 0% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 16.0 13.0662251656 122% => OK
Sentence length: 20.0 21.2450331126 94% => OK
Sentence length SD: 60.5040998094 49.2860985944 123% => OK
Chars per sentence: 98.6875 110.228320801 90% => OK
Words per sentence: 20.25 21.698381199 93% => OK
Discourse Markers: 4.4375 7.06452816374 63% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 0.0 4.19205298013 0% => OK
Sentences with positive sentiment : 4.0 4.33554083885 92% => OK
Sentences with negative sentiment : 6.0 4.45695364238 135% => 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: 0.516470317092 0.272083759551 190% => OK
Sentence topic coherence: 0.164955996272 0.0996497079465 166% => OK
Sentence topic coherence SD: 0.111602937433 0.0662205650399 169% => OK
Paragraph topic coherence: 0.306372653784 0.162205337803 189% => OK
Paragraph topic coherence SD: 0.10224056441 0.0443174109184 231% => More connections among paragraphs wanted.
Essay readability:
automated_readability_index: 11.6 13.3589403974 87% => Automated_readability_index is low.
flesch_reading_ease: 59.64 53.8541721854 111% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 9.9 11.0289183223 90% => OK
coleman_liau_index: 10.97 12.2367328918 90% => OK
dale_chall_readability_score: 7.65 8.42419426049 91% => OK
difficult_words: 62.0 63.6247240618 97% => OK
linsear_write_formula: 11.0 10.7273730684 103% => OK
gunning_fog: 10.0 10.498013245 95% => OK
text_standard: 10.0 11.2008830022 89% => 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.