Question

All of the following are common characteristic between Columba and Ornithorhynchus except:

• A. Oviparous organisms
• B. Exhibit pulmonary respiration
• C. Show internal fertilisation
• D. Presence of pneumatic bones

Answer 1

The correct option is D Presence of pneumatic bones

In Columba (pigeon), endoskeleton is fully ossified (bony) and the long bones are hollow with air cavities (pneumatic).

While Ornithorhynchus (platypus) is an egg laying mammal. It do not have pneumatic bones.