Question

Characteristic feature/s of Aves is/are:

• A. Presence of beak and feathers
• B. Ability to lay eggs
• C. Breathe through lungs
• D. All of the above

Answer 1

The correct option is D All of the above

All birds fall under the category of Aves. The characteristic features of this class are listed below:

• They are warm-blooded and have a four-chambered heart.
• They lay eggs.
• The body is covered with feathers and the forelimbs are modified into wings.
• Birds have presence of beaks. The beaks are devoid of teeth.
• They breathe through the lungs.
• Bones are lightweight and spongy due to the presence of air cavities.
  

So, the correct answer is option D.