The zebra mussel, a freshwater shellfish native to Eastern Europe, has long been spreading out from its original habitats and has now reached parts of North America. There are reasons to believe that this invasion cannot be stopped and that it poses a serious threat to freshwater fish populations in all of North America.
First, the history of the zebra mussel's spread suggests that the invasion might be unstoppable. It is a prime example of an invasion made possible by human transportation. From the zebra mussel，s original habitats in Eastern Europe, ships helped spread it out along new canals built to connect Europe’s waterways. The mussel can attach itself to a ship’ s bottom or can survive in the water—called "ballast water"—that the ship needs to take on to properly balance its cargo. By the early nineteenth century, the mussel had spread to the whole of Europe. It was later carried to the east coast of North America in the ballast water of ships traveling from Europe. The way ships have spread the zebra mussel inthe past strongly suggests that the species will soon colonize all of North America.
Moreover, once zebra mussels are carried to a new habitat, theycan dominate it. They are a hardy species that does well under a variety of conditions, and they have a high rate of reproduction. Most important, however, zebra mussels often have no predators in their new habitats, and species without natural predators are likely to dominate their habitats.
Finally, zebra mussels are likely to cause a decline in the overall fish population in habitats where they become dominant. The mussels are plankton eaters, which means that they compete for food with many freshwater fish species.
The article is about the three reasons that causes the believe that the invasion of the zebra mussel is unstoppable, and that poses a threat to freshwater fish populations. However, the professor says that even though that invasion does not represent a serious threat, but still there are ways to stop it.
First, the reading illustrates that from the history of the spread of the zebra mussel, we can see that it cannot be stopped, especially that it was possibly due to the human transportation by ships since mussels can attach themselves at the bottom of them. In contrast, the professor believes that the problem was because of the fact that people at that time did not have enough knowledge. He says that this problem can be solved if ships refill there water from the ocean since salty water can get rid of zebra mussels.
Second, the article explains that mussels can dominate a new habitat once they carried to it. Moreover, they are hardy species, and have a high rate of reproduction. According to the professor, this case is true, but it is only in the beginning, and the habitat's creatures can adapt with the presence of mussels after a while. For example, birds will find mussels as a new source of food.
Finally, the reading sates that mussels cause a decline in the overall fish population because they are plankton eaters. In contrast the professor says that it might be true that they have a negative effect on some kinds of fish, but the also have a positive effect on other kinds. For instance, they are a source of nutrients for other species.
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Grammar and spelling errors:
Line 1, column 52, Rule ID: A_INFINITVE[1]
Message: Probably a wrong construction: a/the + infinitive
... is about the three reasons that causes the believe that the invasion of the zebra mussel i...
^^^^^^^^^^^
Line 1, column 56, Rule ID: BELIEVE_BELIEF[1]
Message: Did you mean 'belief' (noun) instead of believe (verb)?
Suggestion: belief
...about the three reasons that causes the believe that the invasion of the zebra mussel i...
^^^^^^^
Line 2, column 315, Rule ID: BECAUSE_OF_THE_FACT_THAT[1]
Message: This phrase is redundant. Use simply 'because'.
Suggestion: because
...professor believes that the problem was because of the fact that people at that time did not have enough...
^^^^^^^^^^^^^^^^^^^^^^^^
Line 4, column 124, Rule ID: SENT_START_CONJUNCTIVE_LINKING_ADVERB_COMMA[2]
Message: Did you forget a comma after a conjunctive/linking adverb?
Suggestion: contrast,
...on because they are plankton eaters. In contrast the professor says that it might be tru...
^^^^^^^^
Transition Words or Phrases used:
also, but, finally, first, however, if, moreover, second, so, still, while, for example, for instance, in contrast
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 13.0 10.4613686534 124% => OK
Auxiliary verbs: 9.0 5.04856512141 178% => OK
Conjunction : 6.0 7.30242825607 82% => OK
Relative clauses : 16.0 12.0772626932 132% => OK
Pronoun: 33.0 22.412803532 147% => Less pronouns wanted
Preposition: 32.0 30.3222958057 106% => OK
Nominalization: 5.0 5.01324503311 100% => OK
Performance on vocabulary words:
No of characters: 1294.0 1373.03311258 94% => OK
No of words: 275.0 270.72406181 102% => OK
Chars per words: 4.70545454545 5.08290768461 93% => OK
Fourth root words length: 4.07223819929 4.04702891845 101% => OK
Word Length SD: 2.46832763674 2.5805825403 96% => OK
Unique words: 150.0 145.348785872 103% => OK
Unique words percentage: 0.545454545455 0.540411800872 101% => OK
syllable_count: 397.8 419.366225166 95% => OK
avg_syllables_per_word: 1.4 1.55342163355 90% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 5.0 3.25607064018 154% => OK
Article: 6.0 8.23620309051 73% => OK
Subordination: 0.0 1.25165562914 0% => More adverbial clause wanted.
Conjunction: 6.0 1.51434878587 396% => Less conjunction wanted as sentence beginning.
Preposition: 3.0 2.5761589404 116% => OK
Performance on sentences:
How many sentences: 12.0 13.0662251656 92% => OK
Sentence length: 22.0 21.2450331126 104% => OK
Sentence length SD: 53.1462212517 49.2860985944 108% => OK
Chars per sentence: 107.833333333 110.228320801 98% => OK
Words per sentence: 22.9166666667 21.698381199 106% => OK
Discourse Markers: 9.5 7.06452816374 134% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 4.0 4.19205298013 95% => OK
Sentences with positive sentiment : 4.0 4.33554083885 92% => OK
Sentences with negative sentiment : 5.0 4.45695364238 112% => OK
Sentences with neutral sentiment: 3.0 4.27373068433 70% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.187882420178 0.272083759551 69% => OK
Sentence topic coherence: 0.06429239249 0.0996497079465 65% => OK
Sentence topic coherence SD: 0.0577653493544 0.0662205650399 87% => OK
Paragraph topic coherence: 0.112145991651 0.162205337803 69% => OK
Paragraph topic coherence SD: 0.0616821229786 0.0443174109184 139% => OK
Essay readability:
automated_readability_index: 12.2 13.3589403974 91% => Automated_readability_index is low.
flesch_reading_ease: 66.07 53.8541721854 123% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 9.5 11.0289183223 86% => OK
coleman_liau_index: 10.33 12.2367328918 84% => OK
dale_chall_readability_score: 8.4 8.42419426049 100% => OK
difficult_words: 64.0 63.6247240618 101% => OK
linsear_write_formula: 14.0 10.7273730684 131% => OK
gunning_fog: 10.8 10.498013245 103% => OK
text_standard: 11.0 11.2008830022 98% => OK
What are above readability scores?
---------------------
Rates: 66.6666666667 out of 100
Scores by essay e-grader: 20.0 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.