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 manyfreshwater fish species.
Both the reading and lecture discuss whether the Zebra mussel, a fresh water shellfish indigenous to Europe dispersal all over the North America. The former argues that the propagation pf the Zebra mussel is inevitable and provides three possible reasons to support their points, but latter challenges each of these points.
First of all, the author of the passage asserts that human transportation through the ship is major causes of their dissemination and they carried out to North America. However, the professor in lecture contends that this hypothesis does not hold true because the Zebra mussel's are not unstoppable. In fact, the people actually unaware to these spread, at ship there is a fresh water, but not a ocean water.
Secondly, according to the passage, the expert opined that after reaching to the new home the Zebra mussel dominant the new habitat as they don't have any predator. In contrast, the lecture objects this idea. He supports this argument by presenting the example of local birds which switch to the Zebra mussel as main prey. Indeed the Zebra mussel, was vulnerable to local birds rather than dominator of new habitats.
Finally, the passage claims that spread of Zebra mussels is a root cause of diminishing in the demographic of fish, as they consume plankton, as a result they compete with the fresh water fish which depend upon the plankton. Nevertheless, like two hypothesis before, the professor in his lecture proclaims that this hypothesis is not feasible because the Zebra mussel has optimistic impact on fish species rather than negative impact. In fact, they provides nutrient to the fish which reside in the bottom of the fresh water.
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Grammar and spelling errors:
Line 3, column 394, Rule ID: EN_A_VS_AN
Message: Use 'an' instead of 'a' if the following word starts with a vowel sound, e.g. 'an article', 'an hour'
Suggestion: an
...at ship there is a fresh water, but not a ocean water. Secondly, according to ...
^
Line 5, column 141, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: don't
...mussel dominant the new habitat as they dont have any predator. In contrast, the lec...
^^^^
Line 5, column 323, Rule ID: SENT_START_CONJUNCTIVE_LINKING_ADVERB_COMMA[1]
Message: Did you forget a comma after a conjunctive/linking adverb?
Suggestion: Indeed,
...witch to the Zebra mussel as main prey. Indeed the Zebra mussel, was vulnerable to loc...
^^^^^^
Line 7, column 450, Rule ID: NON3PRS_VERB[2]
Message: The pronoun 'they' must be used with a non-third-person form of a verb: 'provide'
Suggestion: provide
...her than negative impact. In fact, they provides nutrient to the fish which reside in th...
^^^^^^^^
Transition Words or Phrases used:
actually, but, finally, first, however, nevertheless, second, secondly, so, in contrast, in fact, as a result, first of all
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 7.0 10.4613686534 67% => OK
Auxiliary verbs: 0.0 5.04856512141 0% => OK
Conjunction : 5.0 7.30242825607 68% => OK
Relative clauses : 9.0 12.0772626932 75% => More relative clauses wanted.
Pronoun: 21.0 22.412803532 94% => OK
Preposition: 37.0 30.3222958057 122% => OK
Nominalization: 4.0 5.01324503311 80% => OK
Performance on vocabulary words:
No of characters: 1411.0 1373.03311258 103% => OK
No of words: 277.0 270.72406181 102% => OK
Chars per words: 5.09386281588 5.08290768461 100% => OK
Fourth root words length: 4.07962216107 4.04702891845 101% => OK
Word Length SD: 2.53743107847 2.5805825403 98% => OK
Unique words: 154.0 145.348785872 106% => OK
Unique words percentage: 0.5559566787 0.540411800872 103% => OK
syllable_count: 429.3 419.366225166 102% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 2.0 3.25607064018 61% => OK
Article: 9.0 8.23620309051 109% => OK
Subordination: 2.0 1.25165562914 160% => OK
Conjunction: 2.0 1.51434878587 132% => OK
Preposition: 6.0 2.5761589404 233% => Less preposition wanted as sentence beginnings.
Performance on sentences:
How many sentences: 12.0 13.0662251656 92% => OK
Sentence length: 23.0 21.2450331126 108% => OK
Sentence length SD: 50.4058528348 49.2860985944 102% => OK
Chars per sentence: 117.583333333 110.228320801 107% => OK
Words per sentence: 23.0833333333 21.698381199 106% => OK
Discourse Markers: 10.25 7.06452816374 145% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 4.0 4.19205298013 95% => OK
Sentences with positive sentiment : 7.0 4.33554083885 161% => OK
Sentences with negative sentiment : 3.0 4.45695364238 67% => OK
Sentences with neutral sentiment: 2.0 4.27373068433 47% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.175557627722 0.272083759551 65% => OK
Sentence topic coherence: 0.0658988038291 0.0996497079465 66% => OK
Sentence topic coherence SD: 0.0371419211751 0.0662205650399 56% => OK
Paragraph topic coherence: 0.11067919437 0.162205337803 68% => OK
Paragraph topic coherence SD: 0.0320557008712 0.0443174109184 72% => OK
Essay readability:
automated_readability_index: 14.1 13.3589403974 106% => OK
flesch_reading_ease: 56.59 53.8541721854 105% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 11.1 11.0289183223 101% => OK
coleman_liau_index: 12.54 12.2367328918 102% => OK
dale_chall_readability_score: 9.17 8.42419426049 109% => OK
difficult_words: 77.0 63.6247240618 121% => OK
linsear_write_formula: 15.0 10.7273730684 140% => OK
gunning_fog: 11.2 10.498013245 107% => OK
text_standard: 15.0 11.2008830022 134% => OK
What are above readability scores?
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Rates: 81.6666666667 out of 100
Scores by essay e-grader: 24.5 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.