Chapter 24

True or false? Animal cells do not have walls.

A body cavity fully lined with tissue derived from mesoderm is called a(n) ______________.

Flatworms, annelids, and roundworms are all ______________. a. protostomes b. vertebrates c. deuterostomes d. radial

The oldest body fossil of a land animal is of a ______________. a. sponge b. roundworm c. cnidarian d. myriapod

______________ function(s) in the movement of cnidarians. a. A hydrostatic skeleton b. Tube feet c. Cnidocytes d. Malpighian tubules

Earthworms are most closely related to ____________. a. tapeworms b. roundworms c. planarians d. leeches

Annelids and ___________ have a closed circulatory system. a. insects b. cephalopods c. flatworms d. sea stars

Which invertebrate phylum includes the most species? a. mollusks b. roundworms c. arthropods d. flatworms

Did Ediacarans evolve before or after the Cambrian?

A slug is a land-dwelling _____________. a. arthropod b. gastropod c. cephalopod d. crustacean

A barnacle is a shelled ___________. a. arthropod b. gastropod c. cephalopod d. crustacean

___________ include the only winged invertebrates. a. Cnidarians b. Echinoderms c. Rotifers d. Arthropods

The ____________ and _____________ have similar larvae. a. cnidarians/arthropods b. echinoderms/rotifers c. annelids/mollusks d. flatworms/roundworms

Match the organisms with their descriptions. __________ mollusks __________ echinoderms __________ sponges __________ cnidarians __________ flatworms __________ roundworms __________ annelids __________ arthropods a. complete gut, pseudocoelom b. nematocyst producers c. simplest organ systems d. no tissues, filters out food e. jointed exoskeleton f. mantle over body mass g. segmented worms h. tube feet, spiny skin