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 reading and listening material have a debate on dangers of the zebra mussel, a freshwater shellfish, in a new environment and whatever if its growth in population is stoppable. the author believes it is impossible to stop it's growth and provides 2 reasons of support .moreover he explains it's dangers to the fish population. however, the following speaker refutes these points one by one.
first, the author brings the history of the zebra mussel's spread and explains how they attach them self to the bottom of ships and how they can survive the ballast water as a point of unstoppability.the professor explains that its true that zebra mussel' spread couldn't be controlled in past cause people didn't have enough knowledge, however, there are effective ways now like ship required to empty out fresh water and refill with ocean water while still in ocean.
second, the author states that the new environment of zebra mussels lack predator so they become dominant specious .the professor refutes this by saying that this is only temporary and after sometimes local birds will start feeding on them.
and lastly, the author explains about the dangers of zebra mussels on the overall local fish population when they become dominant for they eat planktons and as result, they compete with fishes for food.the professor explains that this only effect fishes that eat plankton and all other fishes would benefit from nutritive materials that zebra mussels excrete.
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Grammar and spelling errors:
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... its growth in population is stoppable. the author believes it is impossible to sto...
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...growth and provides 2 reasons of support .moreover he explains its dangers to the ...
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...ins its dangers to the fish population. however, the following speaker refutes these po...
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...ker refutes these points one by one. first, the author brings the history of the z...
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...pability.the professor explains that its true that zebra mussel spread couldnt be...
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...that its true that zebra mussel spread couldnt be controlled in past cause people did...
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...ebra mussel spread couldnt be controlled in past cause people didnt have enough k...
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...redator so they become dominant specious .the professor refutes this by saying tha...
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...al birds will start feeding on them. and lastly, the author explains about the d...
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Transition Words or Phrases used:
first, however, if, lastly, moreover, second, so, still, while
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 5.0 10.4613686534 48% => More to be verbs wanted.
Auxiliary verbs: 3.0 5.04856512141 59% => OK
Conjunction : 10.0 7.30242825607 137% => OK
Relative clauses : 8.0 12.0772626932 66% => More relative clauses wanted.
Pronoun: 25.0 22.412803532 112% => OK
Preposition: 28.0 30.3222958057 92% => OK
Nominalization: 5.0 5.01324503311 100% => OK
Performance on vocabulary words:
No of characters: 1231.0 1373.03311258 90% => OK
No of words: 240.0 270.72406181 89% => More content wanted.
Chars per words: 5.12916666667 5.08290768461 101% => OK
Fourth root words length: 3.93597934253 4.04702891845 97% => OK
Word Length SD: 2.52115700401 2.5805825403 98% => OK
Unique words: 140.0 145.348785872 96% => OK
Unique words percentage: 0.583333333333 0.540411800872 108% => OK
syllable_count: 368.1 419.366225166 88% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 1.0 3.25607064018 31% => OK
Article: 10.0 8.23620309051 121% => OK
Subordination: 0.0 1.25165562914 0% => More adverbial clause wanted.
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 1.0 2.5761589404 39% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 6.0 13.0662251656 46% => Need more sentences. Double check the format of sentences, make sure there is a space between two sentences, or have enough periods. And also check the lengths of sentences, maybe they are too long.
Sentence length: 40.0 21.2450331126 188% => The Avg. Sentence Length is relatively long.
Sentence length SD: 134.646141175 49.2860985944 273% => The lengths of sentences changed so frequently.
Chars per sentence: 205.166666667 110.228320801 186% => OK
Words per sentence: 40.0 21.698381199 184% => OK
Discourse Markers: 10.3333333333 7.06452816374 146% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 11.0 4.19205298013 262% => Less language errors wanted.
Sentences with positive sentiment : 1.0 4.33554083885 23% => More positive sentences wanted.
Sentences with negative sentiment : 4.0 4.45695364238 90% => OK
Sentences with neutral sentiment: 1.0 4.27373068433 23% => More facts, knowledge or examples wanted.
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.172810061403 0.272083759551 64% => OK
Sentence topic coherence: 0.0857819927435 0.0996497079465 86% => OK
Sentence topic coherence SD: 0.0455149741146 0.0662205650399 69% => OK
Paragraph topic coherence: 0.102179234843 0.162205337803 63% => OK
Paragraph topic coherence SD: 0.0338507542353 0.0443174109184 76% => OK
Essay readability:
automated_readability_index: 22.7 13.3589403974 170% => OK
flesch_reading_ease: 39.34 53.8541721854 73% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 17.7 11.0289183223 160% => OK
coleman_liau_index: 13.07 12.2367328918 107% => OK
dale_chall_readability_score: 9.17 8.42419426049 109% => OK
difficult_words: 54.0 63.6247240618 85% => More difficult words wanted.
linsear_write_formula: 14.0 10.7273730684 131% => OK
gunning_fog: 18.0 10.498013245 171% => OK
text_standard: 18.0 11.2008830022 161% => OK
What are above readability scores?
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Rates: 76.6666666667 out of 100
Scores by essay e-grader: 23.0 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.