Oxygen enters the seaurchin'ssystem through therespiratorysystem, which is through the watervascular system,as the echinoderms have a significant type of system that helps them take theoxygenfrom the water.What is the water vascular system?The watervascularsystem is seen in the phylum of theechinodermata, which is essentially a network of canals and tube feet that run throughout the urchin's body, and thetube feetare helpful for the attachment to the surface and for the respiration. When the tube feet are extended,oxygenfrom the water diffuses across the walls of the tube feet and into theurchin'sbody, while carbon dioxide is released into the water.Hence, oxygen enters the seaurchin'ssystem through therespiratorysystem, which is through the watervascular system,as the echinoderms have a significant type of system that helps them take theoxygenfrom the water.Learn more about thewatervascular system here.brainly.com/question/3572889#SPJ2...

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