Chapter 23

All animals _____. a. consist of tissues arranged as organs b. are motile for at least some stage in the life cycle c. can reproduce asexually as well as sexually d. both a and b

A coelom is a _____. a. type of bristle b. resting stage c. sensory organ d. lined body cavity

Cnidarians alone have _____. a. nematocysts b. a mantle c. a hydrostatic skeleton d. Malpighian tubules

Flukes are most closely related to _____. a. tapeworms b. roundworms c. arthropods d. echinoderms

Which group has the most named species? a. crustaceans b. insects c. mollusks d. roundworms

Nephridia have the same functional role as _____. a. gemmules of sponges b. mandibles of insects c. flame cells of planarians d. tube feet of echinoderms

A spider's chelicerae _____. a. detect light b. inject venom c. produce sillk d.eliminate excess water

Barnacles are shelled _____. a. gastropods b. cephalopods c. arthropods d. copepods

The _____ include the only winged invertebrates. a. cnidarians b. echinoderms c. arthropods d. placozoans

The _____ have a coelom and are radial as adults. a. cnidarians b. echinoderms c. roundworms d. both a and b

Match the organisms with their descriptions. a. complete gut, false coelom b. sister group to animals c. simplest organ systems d. no tissues, no organs e. jointed exoskeleton f. mantle over body mass g. segmented worms h. tube feet, spiny skin i. nematocyst producers 1\. simplest known animal choanoflagellates _____ placozoan _____ sponges _____ cnidarians _____ flatworms _____ roundworms _____ annelids _____ arthropods _____ mollusks _____ echinoderms _____