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As their protection. They are soft bodied animals and the shells serve as armor for their vunerable bodies.

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Lyric Wintheiser

Lvl 13
2y ago
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Wiki User

15y ago

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.

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Wiki User

14y ago
crustacen are used for us to eat like crab,lobster,and shrimp.SORRY THAT ALL I KNOW
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Wiki User

11y ago

The larger crustaceans (shrimps, lobsters, and crabs) are used as food throughout the world, and are therefore important to human economies.

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Wiki User

9y ago

Mandibles

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Q: Why are crustaceans important to humans?
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