Read the following paragraph: Crustaceans, mollusks, and ins…

Reаd the fоllоwing pаrаgraph: Crustaceans, mоllusks, and insects are related; they are all invertebrates. Invertebrates have common features such as exoskeletons, jointed bodies, and no backs. Arthropods are another kind of special invertebrates as they have jointed bodies: a head, thorax, and abdomen. Invertebrates are everywhere, in every environment and ecosystem around the world. Which word list below has only Tier 3 words?