Examples of crustaceans include which of the following?

Examples of crustaceans include which of the following?

• A. Insects
• B. Crabs, crayfish, lobsters, shrimp, barnacles
• C. Spiders
• D. Mollusks

Answer: (B)

Crustaceans are a group of arthropods that are mostly aquatic and have a hard exoskeleton with jointed limbs. The listed examples—crabs, crayfish, lobsters, shrimp, and barnacles—are classic crustaceans, including decapods and sessile barnacles. Insects and spiders belong to other arthropod groups (insects have three body parts and six legs; spiders are arachnids with eight legs), while mollusks are a separate phylum altogether (like snails and clams). So the set with crabs, crayfish, lobsters, shrimp, and barnacles correctly represents crustaceans.

Crustaceans are a group of arthropods that are mostly aquatic and have a hard exoskeleton with jointed limbs. The listed examples—crabs, crayfish, lobsters, shrimp, and barnacles—are classic crustaceans, including decapods and sessile barnacles. Insects and spiders belong to other arthropod groups (insects have three body parts and six legs; spiders are arachnids with eight legs), while mollusks are a separate phylum altogether (like snails and clams). So the set with crabs, crayfish, lobsters, shrimp, and barnacles correctly represents crustaceans.