Question

multiple choice question
crustaceans have variable body forms, but all have
two pairs of antennae.
chelicerae.
book lungs.
membranous wings.

Explanation:

Crustaceans are a group of arthropods. One of the key characteristics that distinguish them from other arthropod groups is the presence of two pairs of antennae. Chelcerae are characteristic of arachnids (a different group of arthropods). Book lungs are respiratory organs found in some arachnids. Membranous wings are not a feature of crustaceans; most crustaceans are aquatic and do not have wings.

Answer:

two pairs of antennae.