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

A body cavity that is fully lined with tissue derived from mesodorm is _____

Most animals have _____ symmetry.

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 c. arthropods b. annelids d. both a and \(\underline{c}\)

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 i. complete gut, false coelom k. first terrestrial tetrapods

Arrange the events in order from most ancient. _____ a. Cambrian explosion of diversity _____ b. origin of animals from colonial protist _____ c. tetrapods move onto the land _____ d. extinction of dinosaurs _____ e. first hominids evolve