The truth is we don’t know what the main cause of
extinction of Steller’s sea cow was. There are problems with each of the
theories that you read about.First, the sea cows were massive
creatures. They were up to nine meters long and could weigh over ten
tons, just enormous. A couple of sea cows could feed a small Siberian
village for months. And the population of the native Siberian people
wasn’t very large. So while the Siberians certainly did hunt the sea
cows, they didn’t need to hunt a lot of them. So it’s unlikely they were
the ones who brought the sea cows to the point of extinction.Second,
about a hypothetical decrease in kelp caused by ecological disturbances,
well, if something severe really happened in the ecosystem near Bering
Island sometime before 1768, it would have affected not just the kelp
but also other parts of the ecosystem. For example, it would have caused
the decline in other marine animals like whales. But fishing ships in
the area did not report a whale decline. Since there is no indication of
broader ecosystem problems, the kelp was probably growing just fine and
the sea cows did not experience food shortage.Third, it might seem like
the European traders were respoThe truth is we don’t know what the main cause of
extinction of Steller’s sea cow was. There are problems with each of the
theories that you read about.First, the sea cows were massive
creatures. They were up to nine meters long and could weigh over ten
tons, just enormous. A couple of sea cows could feed a small Siberian
village for months. And the population of the native Siberian people
wasn’t very large. So while the Siberians certainly did hunt the sea
cows, they didn’t need to hunt a lot of them. So it’s unlikely they were
the ones who brought the sea cows to the point of extinction.Second,
about a hypothetical decrease in kelp caused by ecological disturbances,
well, if something severe really happened in the ecosystem near Bering
Island sometime before 1768, it would have affected not just the kelp
but also other parts of the ecosystem. For example, it would have caused
the decline in other marine animals like whales. But fishing ships in
the area did not report a whale decline. Since there is no indication of
broader ecosystem problems, the kelp was probably growing just fine and
the sea cows did not experience food shortage.Third, it might seem like
the European traders were responsible because the sea cows became
extinct soon after the Europeans arrived. But, actually, by the time
that the Europeans arrived, the sea cow population was already quite
small. We have evidence that the sea cow population was at its largest
hundreds of years before the 1700s. So something was causing a serious
and on-going decrease in the sea cow population long before the
Europeans arrived in the Bering Island area. Whatever this something
was, it should be considered the main cause of the extinction, not the
European traders who were just the last to arrive.nsible because the sea cows became
extinct soon after the Europeans arrived. But, actually, by the time
that the Europeans arrived, the sea cow population was already quite
small. We have evidence that the sea cow population was at its largest
hundreds of years before the 1700s. So something was causing a serious
and on-going decrease in the sea cow population long before the
Europeans arrived in the Bering Island area. Whatever this something
was, it should be considered the main cause of the extinction, not the
European traders who were just the last to arrive.
The reading passage deals with the issue of the reasons for the sea cow's extinction. The professor's lecture focuses on the same issue. Yet, his arguments respectively contradicts what the reading states. And in the lecture, he reveals three pieces of evidence to buttress his view.
To start with, even though the reading passage suggests that the Siberian people overhunted the sea cows causing the extinction, the professor argues in the lecture that the native human's hunt could not be the reason. This is because the sea cows are massive creatures, which are 9 meters tall and weight over ten tons. Therefore, a sea cow can feed the native Siberian people for several months.
Further, contrary to the statement in the reading that the sea cow's extinction caused by the ecosystems disturbances, the professor contends that if there was an ecosystems disturbances, other marine animals would also be influenced. Then, he supports this point with the fact that other marine animals like whales did not decline.
Lastly, the professor asserts that the European traders was not the reason for the extinction whereas the author of the reading claims that the European fur traders caught the sea cows. The professor verifies that this claim is indefensible by pointing out that the sea cow's population has been really small before the European traders came to the island.
In sum, the professor exactly determines the flaws in the reading passage and compellingly proves that the arguments in the reading are all unconvincing.
Grammar and spelling errors:
Line 1, column 69, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'cows'' or 'cow's'?
Suggestion: cows'; cow's
...th the issue of the reasons for the sea cows extinction. The professors lecture focu...
^^^^
Line 5, column 64, Rule ID: POSSESIVE_APOSTROPHE[1]
Message: Possible typo: apostrophe is missing. Did you mean 'cows'' or 'cow's'?
Suggestion: cows'; cow's
...e statement in the reading that the sea cows extinction caused by the ecosystems dis...
^^^^
Line 7, column 271, Rule ID: POSSESIVE_APOSTROPHE[1]
Message: Possible typo: apostrophe is missing. Did you mean 'cows'' or 'cow's'?
Suggestion: cows'; cow's
...defensible by pointing out that the sea cows population has been really small before...
^^^^
Transition Words or Phrases used:
also, but, if, lastly, really, so, then, therefore, whereas, to start with
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 10.0 10.4613686534 96% => OK
Auxiliary verbs: 3.0 5.04856512141 59% => OK
Conjunction : 3.0 7.30242825607 41% => More conjunction wanted.
Relative clauses : 11.0 12.0772626932 91% => OK
Pronoun: 17.0 22.412803532 76% => OK
Preposition: 23.0 30.3222958057 76% => OK
Nominalization: 7.0 5.01324503311 140% => OK
Performance on vocabulary words:
No of characters: 1290.0 1373.03311258 94% => OK
No of words: 249.0 270.72406181 92% => More content wanted.
Chars per words: 5.18072289157 5.08290768461 102% => OK
Fourth root words length: 3.97237131171 4.04702891845 98% => OK
Word Length SD: 2.62981994983 2.5805825403 102% => OK
Unique words: 136.0 145.348785872 94% => More unique words wanted.
Unique words percentage: 0.546184738956 0.540411800872 101% => OK
syllable_count: 381.6 419.366225166 91% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 4.0 3.25607064018 123% => OK
Article: 8.0 8.23620309051 97% => OK
Subordination: 1.0 1.25165562914 80% => OK
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 2.0 2.5761589404 78% => OK
Performance on sentences:
How many sentences: 12.0 13.0662251656 92% => OK
Sentence length: 20.0 21.2450331126 94% => OK
Sentence length SD: 60.0085063415 49.2860985944 122% => OK
Chars per sentence: 107.5 110.228320801 98% => OK
Words per sentence: 20.75 21.698381199 96% => OK
Discourse Markers: 6.16666666667 7.06452816374 87% => OK
Paragraphs: 5.0 4.09492273731 122% => OK
Language errors: 3.0 4.19205298013 72% => OK
Sentences with positive sentiment : 1.0 4.33554083885 23% => More positive sentences wanted.
Sentences with negative sentiment : 4.0 4.45695364238 90% => OK
Sentences with neutral sentiment: 7.0 4.27373068433 164% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.241453615071 0.272083759551 89% => OK
Sentence topic coherence: 0.0895005430817 0.0996497079465 90% => OK
Sentence topic coherence SD: 0.0662827769754 0.0662205650399 100% => OK
Paragraph topic coherence: 0.124623225748 0.162205337803 77% => OK
Paragraph topic coherence SD: 0.0638551461147 0.0443174109184 144% => OK
Essay readability:
automated_readability_index: 13.3 13.3589403974 100% => OK
flesch_reading_ease: 59.64 53.8541721854 111% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 9.9 11.0289183223 90% => OK
coleman_liau_index: 12.76 12.2367328918 104% => OK
dale_chall_readability_score: 8.31 8.42419426049 99% => OK
difficult_words: 58.0 63.6247240618 91% => OK
linsear_write_formula: 7.5 10.7273730684 70% => OK
gunning_fog: 10.0 10.498013245 95% => OK
text_standard: 10.0 11.2008830022 89% => OK
What are above readability scores?
---------------------
Rates: 80.0 out of 100
Scores by essay e-grader: 24.0 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.