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In this set of material, the reading passage mainly discussed that the zebra mussels continue to grow in North America and accounts as a threat to freshwater fish population. While the professor casts doubt on what is stated in the reading and provides some reasons to repudiate the claim.

First of all, based on the reading, zebra mussels' spread is continuing by human's activities through the water ways. Whereas the professor believes that now people have enough knowledge about it and the zebra mussel's population would not increase like the past. Since when ships received to North America and made their ballast water containers, which had zebra mussels, empty. Then, the ships crew can do not empty their containers and inhibit of their spread.

Although the reading states that this species has ability to adapt to the new environment easily and have no predators, the professor refutes this point by saying that it is true that they do not have predator at first but local birds change their habitat for catching them after a while. They feed on zebra mussels and can eat a lot of them. Thus, zebra mussels cannot dominate to the habitat.

At last, the author of the reading claims that competition for plankton among the zebra mussels and other plankton eaters causes a decrease in the fish population. On the contrast, the professor states that even though the zebra mussels have negative impact on plankton eaters, they have positive effect on other species which feed on under water species.

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Since when ships received to North America
Since when ships reached to North America

Attribute Value Ideal
Score: 24 in 30
Category: Good Excellent
No. of Grammatical Errors: 1 2
No. of Spelling Errors: 0 2
No. of Sentences: 11 12
No. of Words: 253 250
No. of Characters: 1229 1200
No. of Different Words: 138 150
Fourth Root of Number of Words: 3.988 4.2
Average Word Length: 4.858 4.6
Word Length SD: 2.275 2.4
No. of Words greater than 5 chars: 86 80
No. of Words greater than 6 chars: 65 60
No. of Words greater than 7 chars: 37 40
No. of Words greater than 8 chars: 18 20
Use of Passive Voice (%): 0 0
Avg. Sentence Length: 23 21.0
Sentence Length SD: 11.119 7.5
Use of Discourse Markers (%): 0.545 0.12
Sentence-Text Coherence: 0.4 0.35
Sentence-Para Coherence: 0.626 0.50
Sentence-Sentence Coherence: 0.131 0.07
Number of Paragraphs: 4 4