TPO 34
The professor says that the reason of extinction of sea cows around Bering Island is not clear yet. In addition, he criticised the reasons which are mentioned by the passage.
First, the first reason in the passage is about overhunting of native people because the sea cow is a good source of food for them. The professor refutes this point. He states that sea cows were massive animals. Their weight was near about ten pounds and each of them could provide food for a long duration for the natives. He adds that the native population at that time in the island was not very large. So they did not to need to hunt many of sea cows.
Second, changing the ecosystems around the Bering Island can cause the shortage of kelp as a main source of food for sea cows which is followed by decreasing in a number of sea cows mentioned by the passage. However, the professor disagrees with this point too. He says that if there was any changing in the ecosystem it should affect other marine animals like whales too while, there was not any evidence about changing on other parts of the Island.
Finally, the passage states that fur traders can cause the extinction of sea cows. The professor indicates that by the time European arrived the Bering Island the number of sea cows was already decreased. The extinction happened long before the European came there.
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Attribute Value Ideal
Score: 26 in 30
Category: Very Good Excellent
No. of Grammatical Errors: 0 2
No. of Spelling Errors: 0 2
No. of Sentences: 14 12
No. of Words: 240 250
No. of Characters: 1088 1200
No. of Different Words: 119 150
Fourth Root of Number of Words: 3.936 4.2
Average Word Length: 4.533 4.6
Word Length SD: 2.23 2.4
No. of Words greater than 5 chars: 75 80
No. of Words greater than 6 chars: 46 60
No. of Words greater than 7 chars: 29 40
No. of Words greater than 8 chars: 18 20
Use of Passive Voice (%): 0 0
Avg. Sentence Length: 17.143 21.0
Sentence Length SD: 9.448 7.5
Use of Discourse Markers (%): 0.5 0.12
Sentence-Text Coherence: 0.366 0.35
Sentence-Para Coherence: 0.538 0.50
Sentence-Sentence Coherence: 0.131 0.07
Number of Paragraphs: 4 4