As their protection. They are soft bodied animals and the shells serve as armor for their vunerable bodies.
Crustaceans are a major food source. For myself my religion is W or Holy Cancer. In W we don't eat crustaceans they are holy. Crustaceans also eat things in the ocean man would rather not come upon. If you think about it Crustaceans are the second most consumed sea life.
The larger crustaceans (shrimps, lobsters, and crabs) are used as food throughout the world, and are therefore important to human economies.
Mandibles
Crustaceans are eaten by humans.
Copepods are widely distributed crustaceans. They serve either directly or indirectly as food sources for most commercially important fish species.
Arthropods are invertebrate animals such as crustaceans. An arthropod that is useful to humans is the lobster, as it can be eaten.
Among crustaceans rather than humans): Horns.
Many humans eat crab and stuff like that at restaurants.Mostly birds that live near water however many types of fish such as the striped bass like crustaceans in their diet as well
becaUSE HUMANS WANT THERE FURE FOR THE LUCERYS LIKE COATS
Seahorses are food for different crustaceans, as well as fish. Their biggest threat is humans, who use them to make medicine.
Crustaceans are omnivores.
It's because all humans are important.
Some crustaceans are omnivores.
no they are crustaceans
Oxygen and carbohydrates are products of photosynthesis that are important to humans.