Question

Character not shared by monotremes and reptiles is

• A. Body covered by hair and four chambered heart
• B. A median T-shaped interclavicle present
• C. Presence of cloaca
• D. Thoracic ribs are single headed

Answer 1

The correct option is A Body covered by hair and four chambered heart

All reptiles have a three-chambered heart (except for a crocodile) consisting of two atria and one ventricle. While monotreme, being mammal, have a four-chambered heart. The body of reptiles is covered by scales while that of mammals is covered by hair.
Thus, the correct answer is option A.