23.Exoskeleton of arthropods is composed of: A. Cellulose B. Chitin C. Glucosamine D. Cutin
Option B Arthropod bodies are supported by external bones or hardened exoskeleton which is made up of chitin. It is produced by their skin which hardens to form a protective outer covering. The exoskeleton is a non-living substance that provides protection and prevents water loss from their body.
