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Among living animals, only birds have_____ .
a. a cloaca c. feathers
b. amniote eggs d. a four-chambered heart
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- The closest modern relatives of birds are ________. a. crocodilians b. mammals c. turtles d. lizardsCharacteristics that evolved in birds to allow for flight includea. reptilian-like scales on the legs.b. a hard-shelled amniotic egg.c. internal fertilization.d. thin, hollow bones in the skeleton.The only living group of mammals that lay eggs rather than give birth to live young are called: A) marsupials B) monotremes C) placentals D) eutherians
- Unlike Archaeopteryx, modern birds have_______ . a. a long bony tail c. a two-chambered heart b. a toothless beak d. feathersThe group of mammals that still lays eggs is referred to as a. Marsupials b. All lay eggs c. Placental Mammals d. Monotremesan amniotic egg was crucial to the evolution of vertebrates because it provides the following to the embryo a) cushioning b) gas exchange c) protection from drying out d) the amniotic provides all of these e) nutrition
- Vertebrates and tunicates share(A) jaws adapted for feeding.(B) a high degree of cephalization.(C) an endoskeleton that includes a skull.(D) a notochord and a dorsal, hollow nerve cordReptiles, including birds, belong to one major lineage of amniotes, and________ belong to another. a. sharks c. mammals b. frogs and toads d. salamandersMonotremes are unique mammals because they: A. posses hair B. give birth to live young C. secret milk in a pouch D. lay eggs
- A major difference between birds and other reptiles is that birdsa. produce a shelled egg. d. care for their young.b. are ectotherms. e. have air sacs.c. are tetrapods.Whale skeletons contain nonfunctional pelvic bonesa. as a result of convergent evolution.b. due to catastrophism.c. because whales evolved from ancestors that had hind legs.d. because the bones might be needed for a future adaptation.Lobe-finned fishes are important because theya. were the first vertebrates.b. were the earliest animals.c. are closely related to tetrapods.d. lack jaws
