Which statement is true about crustacean examples?

• A. They are a group of insects.
• B. They include animals such as lobster and crab.
• C. They have lungs like mammals.
• D. They lack jointed limbs.

Answer: (B)

Crustaceans are arthropods, a diverse group that mainly includes aquatic animals with hard exoskeletons and jointed limbs. Lobster and crab are classic examples, so recognizing them as crustaceans correctly identifies this group. Insects are a different lineage within arthropods, so crustaceans aren’t insects. They don’t have lungs like mammals; instead, many breathe through gills or other aquatic respiratory surfaces. The jointed limbs are a hallmark of crustaceans (and arthropods in general), so the statement that includes creatures like lobster and crab fits the biology best.