Question

Among the following, which are the two fundamental characteristics possessed by mammals but no other living vertebrate?

• A. Milk-producing glands and tail
• B. Vertebral column and limbs
• C. Epidermal hair and vertebral column
• D. Epidermal hair and milk-producing glands

Answer 1

The correct option is D Epidermal hair and milk-producing glands

Mammals are distinguished from other vertebrates by two fundamental characteristics that no other living vertebrate possesses. They are epidermal hair and milk-producing glands. All mammals have hair.All female mammals possess functional mammary glands that secrete milk.