Question

Without exception all the birds

• A. Have functional wings
• B. Have no teeth in the beak
• C. Are homeothermic and oviparous
• D. All of the above

Answer 1

The correct option is C Are homeothermic and oviparous

• Some birds, such as the Kiwi, ostrich, etc., cannot fly as they do not have functional wings.
• Modern birds do not have teeth but some extinct birds were shown to have teeth like Archaeopteryx (fossil bird)
• But all of them are homeothermic (warm-blooded), as they can maintain their body temperature and all birds are oviparous as they lay eggs.

Hence, option C is correct.