Q. The unique character of animals belonging to class-Mammalia is
A) Only mammals possesses hair on skin
B) Completely four chambered heart
C) Presence of mammary glands
D) Fertilisation is internal
Explanation
Mammalia is the only class, which has the presence of mammary glands. It is a unique characteristic among the members of this class but four chamber heart and internal fertilisation found in the members of class-Mammalia as well as Aves
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.