The reading provides three theories about the source of the quacker sound, the strange sound that russian submarines detected during the 1980s; however, the lecturer believes that the passage's interpretation in open to dispute. Therefore, she tries to refute the passage's reasons by bringing up some cogent reasons.
First, the author argues that the calls of male and female orca whales during a courtship ritual might have been the cause of the quacker sound. On the contrary, the lecturer casts doubt on this idea by stating that the orca whales usually lived near the surface of the water, so the russian submarines, which were deep in the water, could not detect the sounds. In addition, the lecturer states that the orca whales are huge animals,
First, the author argues that the calls of male and female orca whales during a courtship ritual might have been the cause of the quacker sound. On the contrary, the lecturer casts doubt on this idea by stating that the orca whales usually lived near the surface of the water, so the russian submarines, which were deep in the water, could not detect the sounds. In addition, the lecturer states that the orca whales are huge animals,