Chapter 15

True or false? Animal cells do not have walls.

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

Earthworms are most closely related to ______. a. insects b. tapeworms c. leeches d. roundworms

The ______ have a cuticle and molt as they grow. a. roundworms b. annelids c. arthropods d. both a and c

List the four distinguishing chordate traits.

True or false? A backbone is always made of bone.

All vertebrates are _____ but only some are ______. a. tetrapods; mammals b. chordates; amniotes c. amniotes; hominids d. bipedal, australopiths

Amniote adaptations to land include _____. a. waterproof skin b. internal fertilization c. highly efficient kidneys d. specialized eggs e. a and c f. all of the above

True or false. All hominids belong to the species Homo.

Birds and placental mammals ______. a. are ectotherms b. lay eggs c. have mammary glands d. have a four-chambered heart

Match the organisms with the appropriate description. ______sponges ______cnidarians ______flatworms ______roundworms ______annelids ______arthropods ______mollusks ______echinoderms ______amphibians ______fishes ______reptiles ______mammals a. most diverse vertebrates b. no true tissues, no organs c. jointed exoskeleton d. mantle over body mass e. segmented worms f. tube feet, spiny skin g. nematocyst producers h. lay amniote eggs i. feed young secreted milk j. complete gut, false coelom k. first terrestrial tetrapods l. saclike gut, no coelom