Which of the following characteristic features always hold true for the corresponding group of animals? 

(a) Viviparous (1) Mammalia
(b) Possess a mouth with an upper and a lower jaw (2) Chordata
(c) 3- chambered heart with one incompletely divided ventricle (3) Reptilia
(d) Cartilaginous - Endoskeleton (4) Chondrichthyes

1. a

2. b

3. c

4. d

Subtopic:  Comparative study of Cartilagenous & Bony Fishes |
 74%
Level 2: 60%+
NEET - 2016
Hints