ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Lugworm body. Close-up of a section of the body of a lugworm (Arenicola marina). Lugworms are a marine species of annelid worm that have parapodia (hair-like outgrowths) and gills. They live in tubes in the seabed where they filter the sand for oxygen, and food.
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