Reasons Why Sea Otter Decline

Both reading passage and lecture are about reasons that made the sea otter to be declined. According to the reading passage, the author claims that environmental pollution and predation are the reasons of this declining. However, the professor doubts that by stating that the reason is the predation only.

First, the passage states that according to the pollution sources that found along the Alaskan coast and the level of chemicals that increased, the sea otter population has declined. In contrast, the professor mentions that the predation is the primary reason for this declining, not pollution. He says that the lack of death on the Alaskan shore casts doubt that the reason of this death is pollution; instead, the predator hypothesises support