Agnostids were a group of marine animals that became extinct about 450 million years ago. Agnostid fossils can be found in rocks in many areas around the world. From the fossil remains, we know that agnostids were primitive arthropods-relatives of modern-day insects. However, the fossil information does not allow paleontologists to determine with certainty what agnostids ate or how they behaved. There are several different theories about how agnostids may have lived. Free-Swimming Predators First, the agnostids may have been free-swimming predators that hunted smaller animals. It is known that other types of primitive arthropods were strong swimmers and active predators, so it is reasonable that the agnostids may have lived that way as well And while the agnostids were small, sometimes just six millimeters long, there were plenty of smaller organisms in the ancient ocean for them to prey on. Seafloor Dwellers Second, they may have dwelled on the seafloor. Again, there are examples of other types of primitive arthropods living this way, so it is possible that agnostids did too. On the seafloor they would have survived by scavenging dead organisms or by grazing on bacteria. Parasites Third, there is the possibility that the agnostids were parasites, living on and feeding off larger organisms. One reason that this seems possible is that there are many species of modern-day arthropods that exist as parasites, such as fleas, ticks, and mites. The agnostids might have lived on primitive fish or even on other, larger arthropods.
In the reading passage, the author discusses three kind of the theories about the habitats that agnostids may have lived there, while the lecturer claim that what the reading passage states have serious weaknesses and disputes those theories by several proofs.
The first theory about the agnostids is that they are free-swimming predators because other type of the primitive arthropods were strong swimmers, while the speaker refutes this claim by saying that all of primitive arthropods had strong eye to detect the prey. Agnostids, on the other hand, had tiny eye or sometimes were blind. Besides, there is no tentacle or sensitive organs which enable agnostids to detect and capture their prey.
The second accepted theory about the agnostids is that they may have lived like seafloor dwellers. By contrast, the speaker views to this issue from an opposite angle. According to the speaker, the seafloor dweller are typically still animals, while because the agnostids are found in the different area, it shows agnostids were very fast and lives in very large area.
The last theory about the agnostids living is that agnostids may were parasites. However, the lecturer demonstrates a different idea, lecturer says that the agnostids population were very large, but the parasites animal population never can be grow up too much, so we could understand that they couldn't have lived like parasites animals.
All in all, the professor clearly identifies the weaknesses of the reading passage and convincingly shows that the theories which are discussion in the reading passage is accurately incorrect.
Grammar and spelling errors:
Line 1, column 52, Rule ID: CD_NN[1]
Message: Possible agreement error. The noun 'kind' seems to be countable, so consider using: 'kinds'.
Suggestion: kinds
...ing passage, the author discusses three kind of the theories about the habitats that...
^^^^
Line 7, column 296, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: couldn't
... much, so we could understand that they couldnt have lived like parasites animals. A...
^^^^^^^
Transition Words or Phrases used:
besides, but, first, however, if, may, second, so, still, well, while, kind of, on the other hand
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 15.0 10.4613686534 143% => OK
Auxiliary verbs: 5.0 5.04856512141 99% => OK
Conjunction : 7.0 7.30242825607 96% => OK
Relative clauses : 11.0 12.0772626932 91% => OK
Pronoun: 18.0 22.412803532 80% => OK
Preposition: 26.0 30.3222958057 86% => OK
Nominalization: 2.0 5.01324503311 40% => More nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1361.0 1373.03311258 99% => OK
No of words: 255.0 270.72406181 94% => More content wanted.
Chars per words: 5.33725490196 5.08290768461 105% => OK
Fourth root words length: 3.99608801488 4.04702891845 99% => OK
Word Length SD: 2.55440155815 2.5805825403 99% => OK
Unique words: 136.0 145.348785872 94% => More unique words wanted.
Unique words percentage: 0.533333333333 0.540411800872 99% => OK
syllable_count: 418.5 419.366225166 100% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 1.0 3.25607064018 31% => OK
Article: 8.0 8.23620309051 97% => OK
Subordination: 3.0 1.25165562914 240% => Less adverbial clause wanted.
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 4.0 2.5761589404 155% => OK
Performance on sentences:
How many sentences: 10.0 13.0662251656 77% => 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: 25.0 21.2450331126 118% => OK
Sentence length SD: 78.9300956543 49.2860985944 160% => OK
Chars per sentence: 136.1 110.228320801 123% => OK
Words per sentence: 25.5 21.698381199 118% => OK
Discourse Markers: 9.7 7.06452816374 137% => OK
Paragraphs: 5.0 4.09492273731 122% => OK
Language errors: 2.0 4.19205298013 48% => OK
Sentences with positive sentiment : 5.0 4.33554083885 115% => 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: 0.243127081932 0.272083759551 89% => OK
Sentence topic coherence: 0.1053571347 0.0996497079465 106% => OK
Sentence topic coherence SD: 0.0778924808638 0.0662205650399 118% => OK
Paragraph topic coherence: 0.126890511573 0.162205337803 78% => OK
Paragraph topic coherence SD: 0.0847689073923 0.0443174109184 191% => OK
Essay readability:
automated_readability_index: 16.5 13.3589403974 124% => OK
flesch_reading_ease: 46.1 53.8541721854 86% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 13.0 11.0289183223 118% => OK
coleman_liau_index: 13.99 12.2367328918 114% => OK
dale_chall_readability_score: 8.22 8.42419426049 98% => OK
difficult_words: 54.0 63.6247240618 85% => More difficult words wanted.
linsear_write_formula: 13.0 10.7273730684 121% => OK
gunning_fog: 12.0 10.498013245 114% => OK
text_standard: 13.0 11.2008830022 116% => OK
What are above readability scores?
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Rates: 80.0 out of 100
Scores by essay e-grader: 24.0 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.