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 in the past strongly suggests that the species will soon colonize all of North America.
Moreover, once zebra mussels are carried to a new habitat, they can 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 reading is about the zebra mussel invasion of North America cannot be curbed. It provides three supporting ideas in order to strengthen its position. However, the narrator says, zebra mussel negative impacts is not that serious to wither a new habitat. He refutes each of the reading claim.
First, the article states that by citing the historical data, zebra mussel invasion is unstoppable. But, the professor denies this. He says that, although the zebra mussel were not control in the past because on that time people had not enough knowledge but, now it is possible to kill the mussel by ocean water. It is possible by refilling the ship with salt rich sea water.
Second, the reading asserts that zebra mussel introduction in a new habitat make them dominant nature. However, the lecturer refutes this reason. He explains, however, zebra mussel were dominate at the beginning but, introducing bird can eat them to suppress their negativity.
Third, the written excerpt claims that in a bossy environment zebra mussel cause the reduction of overall fish population. The point is quite incoherent and unconvincing with the speaker views. He describes, the zebra mussel promotes the bottom fish growth by supplying nutrients. It is true they cause the decline of surface fish population, but their contribution on the down surface is unavoidable.
Grammar and spelling errors:
Line 3, column 182, Rule ID: BEEN_PART_AGREEMENT[2]
Message: Consider using a past participle here: 'controlled'.
Suggestion: controlled
...hat, although the zebra mussel were not control in the past because on that time people...
^^^^^^^
Line 5, column 182, Rule ID: WERE_VBB[1]
Message: Did you mean 'where' or 'we'?
Suggestion: where; we
...son. He explains, however, zebra mussel were dominate at the beginning but, introduc...
^^^^
Line 5, column 187, Rule ID: BEEN_PART_AGREEMENT[1]
Message: Consider using a past participle here: 'dominated'.
Suggestion: dominated
...He explains, however, zebra mussel were dominate at the beginning but, introducing bird ...
^^^^^^^^
Transition Words or Phrases used:
but, first, however, second, so, then, third, it is true
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 11.0 10.4613686534 105% => OK
Auxiliary verbs: 2.0 5.04856512141 40% => OK
Conjunction : 4.0 7.30242825607 55% => More conjunction wanted.
Relative clauses : 6.0 12.0772626932 50% => More relative clauses wanted.
Pronoun: 22.0 22.412803532 98% => OK
Preposition: 24.0 30.3222958057 79% => OK
Nominalization: 7.0 5.01324503311 140% => OK
Performance on vocabulary words:
No of characters: 1144.0 1373.03311258 83% => OK
No of words: 220.0 270.72406181 81% => More content wanted.
Chars per words: 5.2 5.08290768461 102% => OK
Fourth root words length: 3.85128510684 4.04702891845 95% => OK
Word Length SD: 2.62497540327 2.5805825403 102% => OK
Unique words: 131.0 145.348785872 90% => More unique words wanted.
Unique words percentage: 0.595454545455 0.540411800872 110% => OK
syllable_count: 349.2 419.366225166 83% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 7.0 3.25607064018 215% => Less pronouns wanted as sentence beginning.
Article: 9.0 8.23620309051 109% => OK
Subordination: 1.0 1.25165562914 80% => OK
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 0.0 2.5761589404 0% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 15.0 13.0662251656 115% => OK
Sentence length: 14.0 21.2450331126 66% => The Avg. Sentence Length is relatively short.
Sentence length SD: 38.4828966339 49.2860985944 78% => OK
Chars per sentence: 76.2666666667 110.228320801 69% => OK
Words per sentence: 14.6666666667 21.698381199 68% => OK
Discourse Markers: 3.73333333333 7.06452816374 53% => More transition words/phrases wanted.
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 3.0 4.19205298013 72% => 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: 6.0 4.27373068433 140% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.192402075241 0.272083759551 71% => OK
Sentence topic coherence: 0.0657731115662 0.0996497079465 66% => OK
Sentence topic coherence SD: 0.0663696523227 0.0662205650399 100% => OK
Paragraph topic coherence: 0.117333289768 0.162205337803 72% => OK
Paragraph topic coherence SD: 0.0516871858596 0.0443174109184 117% => OK
Essay readability:
automated_readability_index: 10.4 13.3589403974 78% => Automated_readability_index is low.
flesch_reading_ease: 57.27 53.8541721854 106% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 8.8 11.0289183223 80% => OK
coleman_liau_index: 12.29 12.2367328918 100% => OK
dale_chall_readability_score: 8.64 8.42419426049 103% => OK
difficult_words: 60.0 63.6247240618 94% => OK
linsear_write_formula: 6.5 10.7273730684 61% => OK
gunning_fog: 7.6 10.498013245 72% => OK
text_standard: 9.0 11.2008830022 80% => OK
What are above readability scores?
---------------------
Rates: 78.3333333333 out of 100
Scores by essay e-grader: 23.5 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.