Which statement is NOT a typical feature of crustaceans?

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Multiple Choice

Which statement is NOT a typical feature of crustaceans?

Crustaceans are best understood by their two-part body plan, where the head and thorax are often fused into a cephalothorax, followed by the abdomen. That arrangement gives two main body regions rather than three, so describing crustaceans as having three body regions isn’t typical. In addition, crustaceans normally have a pair of antennae for sensing, and they exchange gases either through gills in aquatic species or by diffusion across the moist body surface in others. These features—two main body regions, paired antennae, and respiration via gills or body surface—are standard, while the idea of three body regions doesn’t fit the usual crustacean organization.

Crustaceans are best understood by their two-part body plan, where the head and thorax are often fused into a cephalothorax, followed by the abdomen. That arrangement gives two main body regions rather than three, so describing crustaceans as having three body regions isn’t typical. In addition, crustaceans normally have a pair of antennae for sensing, and they exchange gases either through gills in aquatic species or by diffusion across the moist body surface in others. These features—two main body regions, paired antennae, and respiration via gills or body surface—are standard, while the idea of three body regions doesn’t fit the usual crustacean organization.

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