A very small animal (about 0.5‒1.5 mm in length) with fleshy, unjointed legs that lives in marine sand is most likely a(n)

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Tardigrades, commonly known as water bears, are microscopic animals that can be found in marine sand. They have fleshy, unjointed legs. Onychophorans, chelicerates, crustaceans, and hexapods are all larger and more complex animals, and are not typically found living in sand.

A Very Small Animal (About 0