Exoskeleton - an internal framework of bone., vaccination - a microorganism, especially one which causes disease., Invertebrates - Vaccination is the administration of a vaccine to help the immune system develop immunity from a disease, Skeleton - any animal that lacks a vertebral column, or backbone, Infectious disease - An exoskeleton is a hard covering that supports and protects the bodies of some types of animals., Germs - able to be passed from one person, animal,

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