Here is an example in sea stars. Water enters into the body of the sea star though a plate on the top. The water rushes through the body and down each of it's tentacles. The moving water fuels the hydraulic system of its tube feet. Because of the water entering it's body, its muscles can move its feet and allow movement for the whole sea star. The same is true with most echinoderms.
Echinoderms use their tube feet by using their water vascular system, so their tube feet are basically controlled by a water pressure system. Tube feet are adapted to a different uses in the groups of echinoderms by being able to use their tube feet to attach to objects as well as for protection and the gaining their nutrients.
No, mollusks do not have tube feet. Tube feet are a feature of echinoderms, such as sea stars and sea urchins, which they use for locomotion and feeding. Mollusks typically have a muscular foot for movement instead.
Echinoderms, such as seastars and sea urchins, use their tube feet to move. Tube feet have suction discs which allows the echinoderm to crawl or stick to various surfaces.
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Echinoderms, such as sea stars and sea urchins, have an endoskeleton made of hard plates called ossicles that lie inside their bodies. Although this endoskeleton is internal, it functions similarly to an exoskeleton by providing support and protection. It allows echinoderms to control their body shape and movement, just like an exoskeleton does for other invertebrates.
With a model, a scientist can explain or analyze an object, system, or concept in more detail.
With a model, a scientist can explain or analyze an object, system, or concept in more detail.