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Hello dear friends, I'm impressed because of the collaborative environment in this forum, that makes me feel that the world isn't selfish at all and that sharing and helping is one of the most important values for the success of society. By the way, I would be really greatfull if you guys can take a look at my essay which is done in the preparing stage for my toefl exam. :playful: Here it is: In contrast to the reading passage, which supports the idea of contamination as the cause for the decreasing of sea otter’s population in the northern of Alaska, the lecturer emphasizes on the point that the predator’s attacks are the main reason for such event. The passage explains that sea otter mortality’s rising is led by contamination produced by oil rigs operating in the zone, additionally, the pattern of mortality, which is characterized by a highly otter’s decreasing in some areas and almost nothing in another ones is because of marine currents which concentrates the contaminants in some regions and causing the death to mammals that lives there. On the other hand, the professor refutes this point by noting that the otter’s death in this way will cause dead bodies to get to the coast, which is not happening now. Professor states his hypothesis based on that the predators (like Orcas) are changing their diet mainly because of the difficulty to get whales in the zone, the principal food for them. This difficulty is led by the decreasing in whale’s population produced by the high levels of hunting executed by the human being. Thus, Orcas are killing otters and other little mammals in the absence of whales additionally, the patterns of those behaviors are concentrated in zones where the orcas have access and are uneven in inaccessible rocky areas. To summarize, according to the lecturer, otter’s population decreasing is led by Orca’s diet changes and is supported by these facts: no dead bodies at the coast, orca’s difficulty to get whales in the area and pattern of otter’s population higher in orca’s inaccessible areas. The professor’s ideas contrast and in some ways refutes the reading passage hypothesis of contamination.