Mammals are the most successful & dominant animals today” Give evidence.
Mammals are the most successful and dominant animals on the planet today. They thrive in the majority of the world's environments. The unique characteristics of mammals are: - (i) Body covered with hair. (ii) Presence of sweat and sebaceous glands in the skin. (iii) Presence of mammary glands in females that produce milk. (iv) Presence of a pair of external ears and three ear ossicles i.e., malleus, incus and stapes. (v) The heart has four chambers. (vi) RBCs are biconcave and lack a nucleus (enucleated). (vii) The testis is located outside the abdomen in a special pouch called the scrotum. (viii) Mostly viviparous (produces young ones). (ix) The embryo is attached to the uterine wall with the help of the placenta. (x) The skull is dicondylic, i.e., it has two occipital condyles.
