HUMAN NUTRITION

Detailed explanation-1: -Endoskeleton can be seen in human and other vertebrates whereas an exoskeleton is mainly found in arthropods. Endoskeleton is made up of hard bones and cartilage. Chitin and calcium carbonate formed the exoskeleton system. Note: Arthropods are the largest phylum of Animalia group.

Detailed explanation-2: -Chitin is translucent and tough in its pure form, but it also combines with other materials to form a strong outer structure. For example, in arthropods, it combines with proteins while in crustaceans, it combines with calcium carbonate. This material makes the exoskeleton and shells hard, tough, and stiff.