Both the reading and the lecturer talk about the extinction of the Steller sea cow, which was a very large marine animal that lived in the cost of Siberia. Although the cause of extinction is not entirely certain, The passage claims 3 theories of why these large animals probably cease to exist. However, the lecturer presents counter arguments for each of the passage theories, effectively casting doubt on them.
First, the author of the passage says that overhunting was the main cause of their extinction. He points out that the food was scarce in Siberia, thus leading its native to overhunt the animals throughout hundreds of years. The professor rebuts this argument. He explains that the animals in question were immense and only one of them was probably enough to feed the natives for a week. Furthermore, he adds that the population of natives in Siberia was small, making it unlikely for them to overhunt the Steller sea cow.
Second, the passage claims that disturbances in the ecosystem led these animals to disappear. It is mentioned that kelp, a type of sea plant that was their main source of food, was very susceptible to environmental changes. Moreover, the author suggests that an environmental disturbance probably took place. The lecturer casts doubt on this claim. Pointing out that if such environmental change took place, there would be more severe consequences documented. He argues that whales should also have been affected because they also feed off kelp.
Finally, the Author presents the theory that European fur traders played a major role in this animal's extinction. He says that these traders are known to have hunted the last sea cow in 1768 and is reasonable to think that their hunt severely affected the creature. The lecturer opposes this argument. He states that the fur hunters arrived when the sea cow's population was already small. He puts forth the idea that another factor should have played a role in the animal's disappearance.
Grammar and spelling errors:
Line 7, column 95, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'animals'' or 'animal's'?
Suggestion: animals'; animal's
...fur traders played a major role in this animals extinction. He says that these traders ...
^^^^^^^
Line 7, column 355, Rule ID: POSSESIVE_APOSTROPHE[1]
Message: Possible typo: apostrophe is missing. Did you mean 'cows'' or 'cow's'?
Suggestion: cows'; cow's
...at the fur hunters arrived when the sea cows population was already small. He puts f...
^^^^
Line 7, column 466, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'animals'' or 'animal's'?
Suggestion: animals'; animal's
...factor should have played a role in the animals disappearance.
^^^^^^^
Transition Words or Phrases used:
also, but, finally, first, furthermore, however, if, moreover, second, so, thus
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 15.0 10.4613686534 143% => OK
Auxiliary verbs: 3.0 5.04856512141 59% => OK
Conjunction : 3.0 7.30242825607 41% => More conjunction wanted.
Relative clauses : 18.0 12.0772626932 149% => OK
Pronoun: 40.0 22.412803532 178% => Less pronouns wanted
Preposition: 35.0 30.3222958057 115% => OK
Nominalization: 11.0 5.01324503311 219% => Less nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1654.0 1373.03311258 120% => OK
No of words: 328.0 270.72406181 121% => OK
Chars per words: 5.04268292683 5.08290768461 99% => OK
Fourth root words length: 4.25567506705 4.04702891845 105% => OK
Word Length SD: 2.60510041757 2.5805825403 101% => OK
Unique words: 176.0 145.348785872 121% => OK
Unique words percentage: 0.536585365854 0.540411800872 99% => OK
syllable_count: 502.2 419.366225166 120% => 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: 10.0 8.23620309051 121% => OK
Subordination: 1.0 1.25165562914 80% => OK
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 0.0 2.5761589404 0% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 19.0 13.0662251656 145% => OK
Sentence length: 17.0 21.2450331126 80% => The Avg. Sentence Length is relatively short.
Sentence length SD: 35.51286295 49.2860985944 72% => OK
Chars per sentence: 87.0526315789 110.228320801 79% => OK
Words per sentence: 17.2631578947 21.698381199 80% => OK
Discourse Markers: 4.15789473684 7.06452816374 59% => More transition words/phrases wanted.
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 3.0 4.19205298013 72% => OK
Sentences with positive sentiment : 2.0 4.33554083885 46% => More positive sentences wanted.
Sentences with negative sentiment : 10.0 4.45695364238 224% => Less negative sentences wanted.
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: 0.380085979968 0.272083759551 140% => OK
Sentence topic coherence: 0.105021362755 0.0996497079465 105% => OK
Sentence topic coherence SD: 0.0939545995072 0.0662205650399 142% => OK
Paragraph topic coherence: 0.223893324287 0.162205337803 138% => OK
Paragraph topic coherence SD: 0.0444160788671 0.0443174109184 100% => OK
Essay readability:
automated_readability_index: 10.9 13.3589403974 82% => Automated_readability_index is low.
flesch_reading_ease: 62.68 53.8541721854 116% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 8.7 11.0289183223 79% => OK
coleman_liau_index: 11.66 12.2367328918 95% => OK
dale_chall_readability_score: 7.9 8.42419426049 94% => OK
difficult_words: 71.0 63.6247240618 112% => OK
linsear_write_formula: 10.5 10.7273730684 98% => 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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Write the essay in 20 minutes.
Rates: 71.6666666667 out of 100
Scores by essay e-grader: 21.5 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.