Which group includes crabs, lobsters, and shrimp?

• A. Chondrichthyes
• B. Cryptic Coloration
• C. Cnidaria
• D. Crustacea

Answer: (D)

Crabs, lobsters, and shrimp are crustaceans, a major group of arthropods. They typically have a hard exoskeleton made of chitin, segmented bodies, and paired limbs, with most living in aquatic environments. A hallmark of crustaceans is having two pairs of antennae, and in many decapods the body is organized as a cephalothorax plus abdomen, with shedding (molting) as they grow. This combination of features distinguishes crustaceans from other groups like cartilaginous fishes or cnidarians, and from non-biological concepts like coloration patterns. So the group that includes crabs, lobsters, and shrimp is Crustacea.