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.
The reading states that while the fossil of agnostids does not reveal what they actually ate and how they behaved but present several theories, these might have revealed their characteristics. However, the lecturer challenges the claims made by the author. He explains that unfortunately all of these theories are unconvincing and have some weaknesses and the lecturer refutes each of the author's claims.
First of all, the author argues that agnostids were free-swimming animals and they would able to hunted smaller animals. this specific argument is challenged by the lecturer. he says that free-swimming animals must have large developed eyes but on the other hand agnostids have no eye and sometimes they are blind. furthermore, the lecturer says that agnostids might have other sensory systems that actually privileged them to prey animal but this evidence not to present anywhere, hence this argument of author does not hold water.
Next, the reading states that the agnostids would live in seafloor because others primitive arthopods living this way thus agnostids did the same thing. The lecturer, however, rebuts this claim that sea-floor dwellers normally move very slowly and they are colonized in a specific geographic area but agnostids have shown completely different characteristics. the lecturer elaborates on this point that agnostids are like to live in multiple areas and that' why they have moved one place to another quickly, thus these characteristics not to indicate the agnostids behavior.
Finally, the reading posits parasite theory that agnostids were parasites and they would like to live on primitive fish or even on others because many present-day anthopods are likely to exist as parasites. In contrast, the lecturer position is that parasite have a small population size and their members are killed by their host organism but agnostids have a large population and they are not to prey their own host member, As a result of this parasites theory actually rules out the agnostids concept.
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Grammar and spelling errors:
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...y would able to hunted smaller animals. this specific argument is challenged by the ...
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...argument is challenged by the lecturer. he says that free-swimming animals must ha...
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Suggestion: Furthermore
...ve no eye and sometimes they are blind. furthermore, the lecturer says that agnostids might...
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Suggestion: The
...n completely different characteristics. the lecturer elaborates on this point that ...
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Suggestion:
...s are like to live in multiple areas and that why they have moved one place to an...
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...thers because many present-day anthopods are likely to exist as parasites. In con...
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Message: Possible typo: apostrophe is missing. Did you mean 'parasites'' or 'parasite's'?
Suggestion: parasites'; parasite's
...ir own host member, As a result of this parasites theory actually rules out the agnostids...
^^^^^^^^^
Transition Words or Phrases used:
actually, but, finally, first, furthermore, hence, however, if, so, thus, well, while, in contrast, as a result, first of all, on the other hand
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 11.0 10.4613686534 105% => OK
Auxiliary verbs: 6.0 5.04856512141 119% => OK
Conjunction : 16.0 7.30242825607 219% => Less conjunction wanted
Relative clauses : 12.0 12.0772626932 99% => OK
Pronoun: 37.0 22.412803532 165% => Less pronouns wanted
Preposition: 29.0 30.3222958057 96% => OK
Nominalization: 6.0 5.01324503311 120% => OK
Performance on vocabulary words:
No of characters: 1715.0 1373.03311258 125% => OK
No of words: 320.0 270.72406181 118% => OK
Chars per words: 5.359375 5.08290768461 105% => OK
Fourth root words length: 4.22948505376 4.04702891845 105% => OK
Word Length SD: 2.74408276741 2.5805825403 106% => OK
Unique words: 165.0 145.348785872 114% => OK
Unique words percentage: 0.515625 0.540411800872 95% => OK
syllable_count: 540.0 419.366225166 129% => OK
avg_syllables_per_word: 1.7 1.55342163355 109% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 4.0 3.25607064018 123% => OK
Article: 9.0 8.23620309051 109% => OK
Subordination: 1.0 1.25165562914 80% => OK
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: 26.0 21.2450331126 122% => The Avg. Sentence Length is relatively long.
Sentence length SD: 66.3226017282 49.2860985944 135% => OK
Chars per sentence: 142.916666667 110.228320801 130% => OK
Words per sentence: 26.6666666667 21.698381199 123% => OK
Discourse Markers: 12.0 7.06452816374 170% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 7.0 4.19205298013 167% => OK
Sentences with positive sentiment : 3.0 4.33554083885 69% => OK
Sentences with negative sentiment : 7.0 4.45695364238 157% => 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: 0.175768672621 0.272083759551 65% => OK
Sentence topic coherence: 0.0714932068731 0.0996497079465 72% => OK
Sentence topic coherence SD: 0.0477752569612 0.0662205650399 72% => OK
Paragraph topic coherence: 0.112035850528 0.162205337803 69% => OK
Paragraph topic coherence SD: 0.035436726484 0.0443174109184 80% => OK
Essay readability:
automated_readability_index: 17.2 13.3589403974 129% => OK
flesch_reading_ease: 36.63 53.8541721854 68% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 14.6 11.0289183223 132% => OK
coleman_liau_index: 14.1 12.2367328918 115% => OK
dale_chall_readability_score: 8.77 8.42419426049 104% => OK
difficult_words: 78.0 63.6247240618 123% => OK
linsear_write_formula: 8.0 10.7273730684 75% => OK
gunning_fog: 12.4 10.498013245 118% => OK
text_standard: 9.0 11.2008830022 80% => 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.