Chapter 22, Problem 19MC

Endoskeletons: a. protect internal organs and provide structures against which the force of muscle contraction can work. b. differ from exoskeletons in that endoskeletons do not support the external body. c. cannot be found in echinoderms. d. are composed of cartilaginous structures that form the skull. e. compose the arms and legs.

Figure 15.33 Which of the following statements about common features of chordates is true? a. The dorsal hollow nerve cord is part of the chordate central nervous system. b. In vertebrate fishes, the pharyngeal slits become the gills. c. Humans are not chordates because humans do not have a tail. d. Vertebrates do not have a notochord at any point in their development; instead, they have a vertebral column.

The defining trait of hominins is __________. a. tool use b. bipedalism c. a big brain d. endothermy

Which part of the clavicle articulates with the manubrium? shaft sternal end acromial end coracoid process

The main association area in the amphibian brain is the (a) cerebrum (b) medulla (c) neocortex (d) midbrain (e) arachnoid

Among living animals, only birds have ________. a. a cloaca c. feathers b. a four-chambered heart d. amniote eggs

Squamata includes _____. a. crocodiles and alligators b. turtles c. tuataras d. lizards and snakes

A gomphosis ________. is formed by an interosseous membrane connects the tibia and fibula bones of the leg contains a joint cavity anchors a tooth to the jaw

Which of the following pairs of structures are homoplastic? a. the wing skeleton of a bird and the wing skeleton of a bat b. thewingofabirdandthewingofafly c. theeyeofafishandtheeyeofahuman d. the bones in the foot of a duck and the bones in the foot of a chicken e. the toes on the foot of a lizard and the toes on the foot of a human