Question

Human beings give birth to babies and feed on their mother's milk. Therefore they belong to _______ category.

• A. Gnathostomata
• B. Mammalia
• C. Theria
• D. None of the above

Answer 1

The correct option is C

Theria

Humans belong to Phylum Chordata because of the presence of an embryonic notochord. Since this notochord gets replaced with a vertebral column in the fully developed humans, they belong to subphylum Vertebrata. Further, since they have a jawline, they belong to Division Gnathostomata. This division is divided into two superclasses - Pisces (fin-bearers) and Tetrapoda (limb-bearers). Superclass Tetrapoda is sub-divided into 4 major classes - Amphibia, Reptilia, Aves, and Mammalia. Those limb-bearing vertebrates that nourish their young ones with mother's milk are grouped under the class Mammalia. Theria is a subclass to which humans and many other mammals belong.