Both the reading and the listening passage delve into the topic of ways to control the spread of invasive sea stars from the Northern Pacific because this creature threatens the marine ecosystems. Significantly, the listening material contradicts the reading by presenting three counterarguments.
First, The method that the reading claims to introduce is by using a poison, named quicklime. By applying this way, sea stars can largely be eliminated without hurting marine flora and fauna. However, the listening challenges this statement by arguing that this cannot effectively stop the growing of sea stars. Quicklime can not only kill sea stars, but it also destroy native stars, which are critical in maintaining the eco-system in the area. Once the quicklime was applied to the floor, it remain active and soon kill the sea stars. The native stars soon grow to the spaces that sea stars used to live and then die too.
Moreover, parasites are considered to be an efficient way of eradicating sea stars. Due to the lack of natural enemies, sea stars thrive in remote places. Based on native environmental inspections, male stars are susceptible to parasites, which continuously attack male stars' reproductive systems. Thus, the overall population is well-controlled. The listening refutes this assertion by highlighting that these parasites cannot fully destroy the reproductive ability of stars. They still fertilize and give eggs up to 20 million. Obviously, the impact is not valid.
Finally, ballast water, which refers to water that sea star larvae stick to ballast pumps, is deemed as a workable way. Ships load them abroad, contributing to the spread of sea stars. With the application of chemical materials on ships, larvae are prevented from being carried to other places. From the perspective of the listening, such alternative cannot achieve the goal as people imagine. Not only do larvae stick to large-size ships, but they also attach to other objects in sea, such as fishing boats. Therefore, under no circumstances can people eliminate them by implementing this option.