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.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called

voluntary muscles are controlled by the cerebellum.