sentence: Crustaceans have three major body parts.
sentences_after: Generally, they have two pairs of antennae, two eyes, and three pairs of jaws on their head. Most breathe with gills, although certain land crabs have developed lungs. Lobsters and crabs have hard outer skeletons, and tend to preserve well as fossils. As adults, they moult their shells as they grow in size.
concept_name: crustacean
headings: Crustacea