A very small animal (about 0.3 mm in length) with fleshy, unjointed legs and living in marine sand is most likely a(n)

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Tardigrades, also known as water bears or moss piglets, are very small animals (0.1 - 1.5 mm in length) with fleshy, unjointed legs. They are known to inhabit marine sand and other environments. Onychophorans (velvet worms), chelicerates (spiders, scorpions, etc.), crustaceans (crabs, shrimp, etc.), and hexapods (insects) all have jointed legs, which contradicts the characteristic described in the question.

A Very Small Animal (About 0