The article states that there are reasons to believe that the zebra mussel invasion cannot be stopped and that it poses a serious threat to freshwater fish populations in North America. The article provides three reasons of support. However, the professor explains that there are ways to control the zebra mussel spread and refute each of the author's reasons.
First, the reading claims that the history of zebra mussel;s spread suggest that the invasion might be unstoppable. The professor refutes this point by saying that in the past people couldn't control zebra mussel invasion because they don't have enough knowledge. He states that for example people can empty ballast's water of ships and by this zebra mussels that attached to bottom of ships will be thrown away to salt water where they die.
Second, the article posits that zebra mussels often have no predators in their new habitats. However, the professor says that this situation only exists in the beginning of zebra mussels presence in new habitats. According to the professor lots of birds eat mussels and after a while when they know the presence of mussels in their vicinity, they begin to change their habitat and eat mussels.
Third, article states that zebra mussels are likely to cause a decline in the overall fish population in mutual habitats. The professor opposes this point by explaining that mussels only have negative effect on fish populations that prey on planktons. We also learn that mussels can have positive effect on fish populations that live in bottom of water and don't eat on planktons.
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- Integrated task : Zebra Mussels | It is better for children to choose job that are similar to their parent jobs?listening exercises •MessageAuthorToefl writting integrated: Britain #1 (permalink) Fri May 29, 2015 21:17 pm Toefl writting integrated: Br 60
Grammar and spelling errors:
Line 3, column 184, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: couldn't
...point by saying that in the past people couldnt control zebra mussel invasion because t...
^^^^^^^
Line 3, column 235, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: don't
...trol zebra mussel invasion because they dont have enough knowledge. He states that f...
^^^^
Line 7, column 358, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: don't
...ations that live in bottom of water and dont eat on planktons.
^^^^
Transition Words or Phrases used:
also, first, however, second, so, third, while, for example
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 6.0 10.4613686534 57% => More to be verbs wanted.
Auxiliary verbs: 5.0 5.04856512141 99% => OK
Conjunction : 6.0 7.30242825607 82% => OK
Relative clauses : 18.0 12.0772626932 149% => OK
Pronoun: 30.0 22.412803532 134% => Less pronouns wanted
Preposition: 35.0 30.3222958057 115% => OK
Nominalization: 4.0 5.01324503311 80% => OK
Performance on vocabulary words:
No of characters: 1323.0 1373.03311258 96% => OK
No of words: 262.0 270.72406181 97% => OK
Chars per words: 5.04961832061 5.08290768461 99% => OK
Fourth root words length: 4.02323427807 4.04702891845 99% => OK
Word Length SD: 2.33705316438 2.5805825403 91% => OK
Unique words: 126.0 145.348785872 87% => More unique words wanted.
Unique words percentage: 0.480916030534 0.540411800872 89% => More unique words wanted or less content wanted.
syllable_count: 399.6 419.366225166 95% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 3.0 3.25607064018 92% => OK
Article: 8.0 8.23620309051 97% => OK
Subordination: 0.0 1.25165562914 0% => More adverbial clause wanted.
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 1.0 2.5761589404 39% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 12.0 13.0662251656 92% => OK
Sentence length: 21.0 21.2450331126 99% => OK
Sentence length SD: 37.4376333238 49.2860985944 76% => OK
Chars per sentence: 110.25 110.228320801 100% => OK
Words per sentence: 21.8333333333 21.698381199 101% => OK
Discourse Markers: 4.91666666667 7.06452816374 70% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 3.0 4.19205298013 72% => OK
Sentences with positive sentiment : 2.0 4.33554083885 46% => More positive sentences wanted.
Sentences with negative sentiment : 5.0 4.45695364238 112% => OK
Sentences with neutral sentiment: 5.0 4.27373068433 117% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.515576268276 0.272083759551 189% => OK
Sentence topic coherence: 0.209508682784 0.0996497079465 210% => Sentence topic similarity is high.
Sentence topic coherence SD: 0.0881612297728 0.0662205650399 133% => OK
Paragraph topic coherence: 0.323197886912 0.162205337803 199% => OK
Paragraph topic coherence SD: 0.0512004472596 0.0443174109184 116% => OK
Essay readability:
automated_readability_index: 13.3 13.3589403974 100% => OK
flesch_reading_ease: 58.62 53.8541721854 109% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 10.3 11.0289183223 93% => OK
coleman_liau_index: 12.01 12.2367328918 98% => OK
dale_chall_readability_score: 7.69 8.42419426049 91% => OK
difficult_words: 50.0 63.6247240618 79% => More difficult words wanted.
linsear_write_formula: 10.5 10.7273730684 98% => OK
gunning_fog: 10.4 10.498013245 99% => OK
text_standard: 11.0 11.2008830022 98% => OK
What are above readability scores?
---------------------
Rates: 73.3333333333 out of 100
Scores by essay e-grader: 22.0 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.