In the lecture, the professor argues against the population hypothesis and contents that predation is more likely cause the decline of sea otter populations.
First and foremost, the pollution theory is weakened by the fact that people scarcely found dead sea otters washed up Alaskan coast. Because if they are killed by pollution, it would be common to find dead sea otters washed up shores. By contrast, if they are actually killed by predators, their body would not immediately show up on shores. Therefore, the predation might explain the decline of sea otters.
Second, it's true that orca preys on larger animals such as other whales. But whales have disappeared for centuries because of human hunters. Therefore, in order to survive, the orcas have to change their diet because only smaller animals are available. And this may cause the decline of the population of seals, sea lions and sea otters.
Last but not the least, the uneven pattern of otter decline can be better explained by predation hypothesis than pollution hypothesis. The population decline of sea otters seems to depend on whether their habitat is accessible for orca. Because orca are very large, they can only prey on the sea otters that live in open water, where the see otter population declined significantly. However, in the shallow and rocky location, where the orca could not achieve, the sea otter population is not effected.
Therefore, based on the aforementioned analysis, the professor supports the predation hypothesis.
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- TPO-48 - Integrated Writing Task In recent years, many frog species around the world have declined in numbers or even gone extinct due to changes in their environment. These population declines and extinctions have serious consequences for the ecosystems 80
- TPO-10 - Integrated Writing Task The sea otter is a small mammal that lives in waters along the western coast of North America from California to Alaska. When some sea otter populations off the Alaskan coast started rapidly declining a few years ago, it c 80
Grammar and spelling errors:
Line 5, column 101, Rule ID: WHITESPACE_RULE
Message: Possible typo: you repeated a whitespace
Suggestion:
...ther whales. But whales have disappeared for centuries because of human hunters. ...
^^
Transition Words or Phrases used:
actually, but, first, however, if, may, second, so, therefore, such as
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 10.0 10.4613686534 96% => OK
Auxiliary verbs: 7.0 5.04856512141 139% => OK
Conjunction : 7.0 7.30242825607 96% => OK
Relative clauses : 6.0 12.0772626932 50% => More relative clauses wanted.
Pronoun: 13.0 22.412803532 58% => OK
Preposition: 29.0 30.3222958057 96% => OK
Nominalization: 13.0 5.01324503311 259% => Less nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1276.0 1373.03311258 93% => OK
No of words: 245.0 270.72406181 90% => More content wanted.
Chars per words: 5.20816326531 5.08290768461 102% => OK
Fourth root words length: 3.95632099841 4.04702891845 98% => OK
Word Length SD: 2.67108477543 2.5805825403 104% => OK
Unique words: 130.0 145.348785872 89% => More unique words wanted.
Unique words percentage: 0.530612244898 0.540411800872 98% => OK
syllable_count: 405.9 419.366225166 97% => 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: 8.0 8.23620309051 97% => OK
Subordination: 3.0 1.25165562914 240% => Less adverbial clause wanted.
Conjunction: 2.0 1.51434878587 132% => OK
Preposition: 4.0 2.5761589404 155% => OK
Performance on sentences:
How many sentences: 14.0 13.0662251656 107% => OK
Sentence length: 17.0 21.2450331126 80% => The Avg. Sentence Length is relatively short.
Sentence length SD: 27.603608164 49.2860985944 56% => The essay contains lots of sentences with the similar length. More sentence varieties wanted.
Chars per sentence: 91.1428571429 110.228320801 83% => OK
Words per sentence: 17.5 21.698381199 81% => OK
Discourse Markers: 5.0 7.06452816374 71% => OK
Paragraphs: 5.0 4.09492273731 122% => OK
Language errors: 1.0 4.19205298013 24% => OK
Sentences with positive sentiment : 3.0 4.33554083885 69% => OK
Sentences with negative sentiment : 5.0 4.45695364238 112% => OK
Sentences with neutral sentiment: 6.0 4.27373068433 140% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.38041414392 0.272083759551 140% => OK
Sentence topic coherence: 0.131475455597 0.0996497079465 132% => OK
Sentence topic coherence SD: 0.0733975062042 0.0662205650399 111% => OK
Paragraph topic coherence: 0.182632999674 0.162205337803 113% => OK
Paragraph topic coherence SD: 0.0998874538456 0.0443174109184 225% => More connections among paragraphs wanted.
Essay readability:
automated_readability_index: 11.9 13.3589403974 89% => Automated_readability_index is low.
flesch_reading_ease: 45.76 53.8541721854 85% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 11.1 11.0289183223 101% => OK
coleman_liau_index: 12.64 12.2367328918 103% => OK
dale_chall_readability_score: 8.48 8.42419426049 101% => OK
difficult_words: 62.0 63.6247240618 97% => OK
linsear_write_formula: 8.0 10.7273730684 75% => OK
gunning_fog: 8.8 10.498013245 84% => OK
text_standard: 9.0 11.2008830022 80% => OK
What are above readability scores?
---------------------
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.