The Ordovician period is a geologic period that occurred around 440-485 million years ago and lasted for approximately 45 million years. During this time period the oceans teemed with life. Life on land was still in the early stages of diversification. This period came to an end after a series of extinction events that created the second largest major extinction in Earth's history. There are several possible explanations for the cause of the mass extinction of marine life at the end of the Ordovician period. The following three reasons are the most likely.
First, when the climate cooled significantly ice sheets formed causing the sea level to drop by as much as 100m. This destroyed the habitat of species living in the shallow oceans. It also spelled disaster for species that were adapted to warmer waters and could not survive the cooler conditions that created the ice sheets.
A second theory is that the impact from a meteorite caused the mass extinction. The dust created from such an impact would be enough to completely block out the sun. Since many organisms, especially those near the ocean surface, relied on sunlight as part of their survival then the complete blocking of the sun would be devastating to these creatures.
The third theory is super UV rays. This theory states the sun's ultraviolet rays were very strong and killed marine organisms living in the ocean surface. Fossils found showing the disappearance of one kind of marine life in the ocean surface provide evidence for this theory.
In the reading passage, three main theories are explained which are the reasons for the mass extinction of marine life at the end of the Ordovician period. But in the lecture, these reasons are contradicted by giving other three contradictory reasons for each.
In reading it is mentioned that due to the climate change ice sheets were formed which caused the sea level to drop by 100m and due to that habitat of species destroyed in the shallow oceans. But in the lecture, the contradictory reason is mentioned, like the creation of ice sheets took several years near about 700 years the ice age is formed and ocean species get enough time to adapt the environment. Therefore it is not possible that ice sheets are responsible for mass extinction.
The second theory is mentioned in the reading passage is that meteorite caused mass extinction. The dust was created which is responsible for blocking the sun. And most of the animals were depended on the sunlight. But it is not true according to the lecture as it is not possible to cover the sun completely.
The third theory in the reading passage is super UV rays. The sun's ultraviolet rays were very strong to kill the marine organisms who live in the ocean surface. According to the lecture, it is not possible to learn about the animals from fossils that they live on the ocean surface and not deep into the sea.
So, in conclusion, we can say that the theories which are considered in the reading passage on the basis of evidence are false because the relation between evidence and the situation is considered wrongly as per the lecture, therefore, false theories were made.
Grammar and spelling errors:
Line 2, column 406, Rule ID: SENT_START_CONJUNCTIVE_LINKING_ADVERB_COMMA[1]
Message: Did you forget a comma after a conjunctive/linking adverb?
Suggestion: Therefore,
...t enough time to adapt the environment. Therefore it is not possible that ice sheets are ...
^^^^^^^^^
Transition Words or Phrases used:
but, if, second, so, therefore, third, in conclusion
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 23.0 10.4613686534 220% => Less to be verbs wanted.
Auxiliary verbs: 1.0 5.04856512141 20% => OK
Conjunction : 8.0 7.30242825607 110% => OK
Relative clauses : 11.0 12.0772626932 91% => OK
Pronoun: 14.0 22.412803532 62% => OK
Preposition: 38.0 30.3222958057 125% => OK
Nominalization: 9.0 5.01324503311 180% => OK
Performance on vocabulary words:
No of characters: 1353.0 1373.03311258 99% => OK
No of words: 284.0 270.72406181 105% => OK
Chars per words: 4.76408450704 5.08290768461 94% => OK
Fourth root words length: 4.10515524023 4.04702891845 101% => OK
Word Length SD: 2.58052952174 2.5805825403 100% => OK
Unique words: 135.0 145.348785872 93% => More unique words wanted.
Unique words percentage: 0.475352112676 0.540411800872 88% => More unique words wanted or less content wanted.
syllable_count: 428.4 419.366225166 102% => 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: 5.0 8.23620309051 61% => OK
Subordination: 0.0 1.25165562914 0% => More adverbial clause wanted.
Conjunction: 4.0 1.51434878587 264% => Less conjunction wanted as sentence beginning.
Preposition: 5.0 2.5761589404 194% => OK
Performance on sentences:
How many sentences: 13.0 13.0662251656 99% => OK
Sentence length: 21.0 21.2450331126 99% => OK
Sentence length SD: 62.0637198808 49.2860985944 126% => OK
Chars per sentence: 104.076923077 110.228320801 94% => OK
Words per sentence: 21.8461538462 21.698381199 101% => OK
Discourse Markers: 4.0 7.06452816374 57% => More transition words/phrases wanted.
Paragraphs: 5.0 4.09492273731 122% => OK
Language errors: 1.0 4.19205298013 24% => OK
Sentences with positive sentiment : 4.0 4.33554083885 92% => OK
Sentences with negative sentiment : 4.0 4.45695364238 90% => 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: 0.0802363084976 0.272083759551 29% => The similarity between the topic and the content is low.
Sentence topic coherence: 0.028188932006 0.0996497079465 28% => Sentence topic similarity is low.
Sentence topic coherence SD: 0.0417017679971 0.0662205650399 63% => OK
Paragraph topic coherence: 0.0429409670461 0.162205337803 26% => Maybe some paragraphs are off the topic.
Paragraph topic coherence SD: 0.0390516755219 0.0443174109184 88% => OK
Essay readability:
automated_readability_index: 11.9 13.3589403974 89% => Automated_readability_index is low.
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: 10.33 12.2367328918 84% => OK
dale_chall_readability_score: 7.57 8.42419426049 90% => OK
difficult_words: 52.0 63.6247240618 82% => More difficult words wanted.
linsear_write_formula: 13.5 10.7273730684 126% => OK
gunning_fog: 10.4 10.498013245 99% => OK
text_standard: 10.0 11.2008830022 89% => OK
What are above readability scores?
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It is not exactly right on the topic in the view of e-grader. Maybe there is a wrong essay topic.
Rates: 3.33333333333 out of 100
Scores by essay e-grader: 1.0 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.