Describe two features of an arthropod's structure and function that are similar to your own. Describe two features that are different.

Most terrestrial arthropods exchange respiratory gases using chitin-lined tubes that open to the outside called

$$\textbf{\ \ a.}\text{ tracheae.}$$

$$\textbf{\ \ b.}\text{ ganglia.}$$

$$\textbf{\ \ c.}\text{ book lungs.}$$

$$\textbf{\ \ d.}\text{ gills.}$$

Name one group of arthropods that is now extinct. Name at least three groups still in existence today.

Use the terms below to make lists of characteristics for each of the three groups of arthropods: arachnids, crustaceans, and insects. You can use terms more than once.

tracheae, book lungs, spiracles, Malpighian tubules, ganglia, spinnerets, brain, wings, pedipalps, exoskeleton, cephalothorax, blood, carapace

Give an example of a positive interaction and an example of a negative interaction between insects and humans.

Name the field of biology devoted to the study of insects and give an example of one question this field of biology studies.