▶ Your Answer :
From the listening lecture, the professor casts doubt on the reading passage's idea that environmental contamination enables the number of sea otters to decrease. The professor asserts that an animals' predation is the main causation about declining sea otters for the following subsequent three reasons.
First and foremost, according to the reading passage, on the Alaskan coast, the level of water pollution is high so sea otter's immune system was damaged. The writer states that many sea otters died because of destroying resistance from environmental contamination. In opposition to this argument, the professor claims that there is no evidence regarding environmental pollution. Rather, predators can catch sea otters and their debris washed away.
On top of that, the reading passage describes how environmental pollution can have an impact on many sea mammals such as seals and sea lions. The writer asserts that only environmental factor can affect a wide range of species to harm. In contrast, the professor argues that orca can cause various sea mammals to death. Since human killed a number of huge whales, orca's main prey change from whales to small animals.
Lastly, the professor rebuts the reading passage's point that the erratic pattern of sea otter's death is made by environmental contamination. The professor points out that killer whales can access readily shallow rocky coast. In addition, the number of sea otters not diminished in the place where the killer whale could not approach. |