IB Biology Exam Prep

Answer: B, Tapeworm. An arthropod is an invertebrate with an exoskeleton (external skeleton), a segmented body, and joined attachments called appendages.

Key Takeaway: Arthropods are comprised of a diverse array of organisms, and are estimated to account for up to 80% of the known types of living species. Arthropods range from winged insects such as the bee to aquatic freshwater animals such as the lobster. Tapeworms are also invertebrates but do not possess an exoskeleton or a segmented body.