BIOLOGICAL CLASSIFICATION
KINGDOM ANIMALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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have arms that extend outward from middle of bodyspiny skinget oxygen from tube feet
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soft bodies with a thick muscular footmore developed than worms and sponges some have shells breathe with gills or lungs
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jointed legs, segmented bodies, some have wingsHard outer covering called exoskeletonget oxygen through gills or air tubes
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segmented worms
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Detailed explanation-1: -By expanding and contracting chambers within the water vascular system, the echinoderm can force water into certain tube feet to extend them. The animal has muscles in the tube feet which are used to retract them.
Detailed explanation-2: -They use their tube feet to attach to rocks, but also for locomotion. All echinoderms have tube feet. Like we mentioned in the introduction, tube feet help the animal to move and hold onto the rocks. Another characteristic of echinoderms is that they are capable of regeneration.
Detailed explanation-3: -Sea stars have a water vascular system and tube feet much like those of the sea urchins. Ambulacral grooves (from the Latin root ambul meaning walk) are narrow channels in the oral surface of a sea star filled with tube feet. The tube feet are used mainly for grabbing and locomotion.
Detailed explanation-4: -The canals lead to podia, or tube feet, which are sucker-like appendages that the echinoderm can use to move, grip the substrate, or manipulate objects. These tube feet are extended and retracted by hydraulic pressure in the water-vascular system.