Question

The unique mammalian characteristics are:

• A. hairs, pinna and mammary glands
• B. hairs, pinna and indirect development
• C. pinna, monocondylic skull and mammary glands
• D. hairs, tympanic membrane and mammary glands

Answer 1

The Correct Option is A

Mammals are a diverse group of animals known for several defining characteristics that distinguish them from other vertebrates. The unique features that characterize mammals include:

• Hairs: Most mammals have hair or fur on their bodies, which serves as insulation, helping them maintain a constant body temperature.
• Pinna: The external ear, also known as the pinna, helps in capturing sound waves and is a distinctive feature in most mammals.
• Mammary Glands: These are specialized glands in female mammals that produce milk to nourish their young, a key aspect of mammalian reproduction that ensures the survival of their offspring.

Given these explanations, the correct option that lists these unique mammalian characteristics is:

hairs, pinna and mammary glands

Answer 2

These three features are distinguishing characteristics of mammals:

• Hairs: Most mammals have hairs (fur or whiskers), which serve various functions such as insulation, camouflage, and sensory perception.
• Pinna (external ears): Mammals generally have external ears, or pinnae, which help in sound localization and are often well-developed in species with acute hearing.
• Mammary glands: Mammals possess mammary glands, which are responsible for producing milk to nourish their young.

The correct option is (A): hairs, pinna and mammary glands.