BoththereadingandthelisteningpassagedelveintothetopicofwaystocontrolthespreadofinvasiveseastarsfromtheNorthernPacificbecausethiscreaturethreatensthemarineecosystems.Significantly,thelisteningmaterialcontradictsthereadingbypresentingthreecounterarguments.First,Themethodthatthereadingclaimstointroduceisbyusingapoison,namedquicklime.Byapplyingthisway,seastarscanlargelybeeliminatedwithouthurtingmarinefloraandfauna.However,thelisteningchallengesthisstatementbyarguingthatthiscannoteffectivelystopthegrowingofseastars.Quicklimecannotonlykillseastars,butitalsodestroynativestars,whicharecriticalinmaintainingtheeco-systeminthearea.Oncethequicklimewasappliedtothefloor,itremainactiveandsoonkilltheseastars.Thenativestarssoongrowtothespacesthatseastarsusedtoliveandthendietoo.Moreover,parasitesareconsideredtobeanefficientwayoferadicatingseastars.Duetothelackofnaturalenemies,seastarsthriveinremoteplaces.Basedonnativeenvironmentalinspections,malestarsaresusceptibletoparasites,whichcontinuouslyattackmalestars'reproductivesystems.Thus,theoverallpopulationiswell-controlled.Thelisteningrefutesthisassertionbyhighlightingthattheseparasitescannotfullydestroythereproductiveabilityofstars.Theystillfertilizeandgiveeggsupto20million.Obviously,theimpactisnotvalid.Finally,ballastwater,whichreferstowaterthatseastarlarvaesticktoballastpumps,isdeemedasaworkableway.Shipsloadthemabroad,contributingtothespreadofseastars.Withtheapplicationofchemicalmaterialsonships,larvaearepreventedfrombeingcarriedtootherplaces.Fromtheperspectiveofthelistening,suchalternativecannotachievethegoalaspeopleimagine.Notonlydolarvaesticktolarge-sizeships,buttheyalsoattachtootherobjectsinsea,suchasfishingboats.Therefore,undernocircumstancescanpeopleeliminatethembyimplementingthisoption.

