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 article and lecture both deal with how agnostids my have lived. Whilst the author proposes three possible hypotheses and provides evidence to support them, the lecturer contradicts his arguments respectively.
First, the author states that agnostids may have lived as strong swimmers and active predators, and there are plenty of smaller organisms in the ancient ocean for them to hunt. In contrast, the professor argues that predators usually have large eyes and well developed vision, while agnostids have tiny eyes and poor visions, and some even are blind. Furthermore, she also rule out the possibility that agnostids may use other sensory organs instead of eyes, as there is no evidence has been obtained so far.
Second, according to the article, agnostids might live on the seafloor, and feed on dead organisms or bacteria. However, the lecturer again questions this argument by pointing out that agnostids live in multiple geological areas, indicating that they may move very fast. This is on contrary to seafloor dwellers, which usually move very slow and live in very small geological area.
Last, the author posits that agnostids could be parasites and lived on fish or other larger organisms because many types of arthropods live this way. As opposed to the writer, the speaker mentions that the population of parasites is often very small, so they would not kill the hosts. Unlike parasites, agnostids lived in large group.
As we can see, the author and lecturer hold very different views on possible ways that agnostids may have lived.
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Grammar and spelling errors:
Line 3, column 374, Rule ID: HE_VERB_AGR[3]
Message: The pronoun 'she' must be used with a third-person verb: 'rules'.
Suggestion: rules
...e even are blind. Furthermore, she also rule out the possibility that agnostids may ...
^^^^
Transition Words or Phrases used:
also, first, furthermore, however, if, may, second, so, well, while, in contrast
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 7.0 15.1003584229 46% => More to be verbs wanted.
Auxiliary verbs: 8.0 9.8082437276 82% => OK
Conjunction : 13.0 13.8261648746 94% => OK
Relative clauses : 9.0 11.0286738351 82% => OK
Pronoun: 19.0 43.0788530466 44% => OK
Preposition: 23.0 52.1666666667 44% => More preposition wanted.
Nominalization: 4.0 8.0752688172 50% => More nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1319.0 1977.66487455 67% => OK
No of words: 253.0 407.700716846 62% => More content wanted.
Chars per words: 5.21343873518 4.8611393121 107% => OK
Fourth root words length: 3.98822939669 4.48103885553 89% => OK
Word Length SD: 2.50172338231 2.67179642975 94% => OK
Unique words: 152.0 212.727598566 71% => More unique words wanted.
Unique words percentage: 0.600790513834 0.524837075471 114% => OK
syllable_count: 407.7 618.680645161 66% => OK
avg_syllables_per_word: 1.6 1.51630824373 106% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 2.0 9.59856630824 21% => OK
Article: 8.0 3.08781362007 259% => Less articles wanted as sentence beginning.
Subordination: 4.0 3.51792114695 114% => OK
Conjunction: 3.0 1.86738351254 161% => OK
Preposition: 2.0 4.94265232975 40% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 12.0 20.6003584229 58% => 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: 21.0 20.1344086022 104% => OK
Sentence length SD: 38.3326086888 48.9658058833 78% => OK
Chars per sentence: 109.916666667 100.406767564 109% => OK
Words per sentence: 21.0833333333 20.6045352989 102% => OK
Discourse Markers: 6.66666666667 5.45110844103 122% => OK
Paragraphs: 5.0 4.53405017921 110% => OK
Language errors: 1.0 5.5376344086 18% => OK
Sentences with positive sentiment : 2.0 11.8709677419 17% => More positive sentences wanted.
Sentences with negative sentiment : 5.0 3.85842293907 130% => OK
Sentences with neutral sentiment: 5.0 4.88709677419 102% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.145519832597 0.236089414692 62% => OK
Sentence topic coherence: 0.0630377369844 0.076458572812 82% => OK
Sentence topic coherence SD: 0.0428337126038 0.0737576698707 58% => OK
Paragraph topic coherence: 0.087278346212 0.150856017488 58% => OK
Paragraph topic coherence SD: 0.0273237119698 0.0645574589148 42% => Paragraphs are similar to each other. Some content may get duplicated or it is not exactly right on the topic.
Essay readability:
automated_readability_index: 13.6 11.7677419355 116% => OK
flesch_reading_ease: 50.16 58.1214874552 86% => OK
smog_index: 3.1 6.10430107527 51% => Smog_index is low.
flesch_kincaid_grade: 11.5 10.1575268817 113% => OK
coleman_liau_index: 12.94 10.9000537634 119% => OK
dale_chall_readability_score: 8.55 8.01818996416 107% => OK
difficult_words: 62.0 86.8835125448 71% => More difficult words wanted.
linsear_write_formula: 11.0 10.002688172 110% => OK
gunning_fog: 10.4 10.0537634409 103% => OK
text_standard: 11.0 10.247311828 107% => OK
What are above readability scores?
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We are expecting: No. of Words: 350 while No. of Different Words: 200
More content wanted.
Rates: 66.6666666667 out of 100
Scores by essay e-grader: 20.0 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.