Researchers view them as miniature animals. They are barrel-shaped and have an alimentary canal where food is transported through to be absorbed. They have a brain and an open body cavity called a hemocoel. This body cavity is filled with fluids and nutrients that reach every part of their body. They have a well-defined head and four body sections. Each section has its own pair of legs, for a total of eight legs. Three of the pairs of legs are for walking and the last pair is for grasping and maneuvering.
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