Do all invertebrates have three pairs of jointed legs?

No, not all invertebrates have three pairs of jointed legs. Invertebrates are a diverse group of animals that include over 95% of all known animal species. They vary greatly in terms of body structure, locomotion, and other characteristics. While some invertebrates, such as insects, have three pairs of jointed legs, others have different numbers of legs or lack legs entirely. For example, spiders have four pairs of legs, while millipedes and centipedes have numerous pairs of legs. Earthworms, leeches, and slugs are examples of invertebrates that do not have legs.