1) Birds are... a) Vertebrates. b) Invertebrates. 2) Birds are... a) Viviparous. b) Oviparous. 3) Their bodies are covered with... a) Scales. b) Feathers. c) Fur. 4) Birds have... a) Wings, a beak and a tail. b) Four legs. c) Scales and fins. 5) Birds breathe with... a) Skin. b) Lungs. c) Gills.

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