Which statement about crustaceans is true? *

(A) all have the same number of appendages

(B) all have an internal skeleton

(C) all have an exoskeleton

(D) only some have jointed appendages

C. All have an exoskeleton

Explanation:

Crustaceans is a subphylum

of Arthropoda. The study of crustaceans is knows as carcinology or crustaceology.

They are important sources of food and they consist of crabs, crayfish, prawns etc. They are closely related to insects in terms of morphological (structural) features.

Crustaceans have varying numbers and structure of appendages. However they lack endoskeletons and possess exoskeletons.