A) Mammals
B) Amphibia
C) Aves
D) Pisces
Correct Answer: D
Solution :
Hippocampus is commonly called sea horse. It belongs to Pisces of Chordata and found in warm seas throughout the world. The head of sea horse is prolonged into a tubular rostrum or snout at the end of which is a small mouth, so the head looks like that of horse. Amphibians were the first vertebrates to invade land. They are cold blooded vertebrates. They have bony skeleton and Z chambered heart, Example-Salamandra, Proteus, Rana tigrina Hyla etc. Aves include the birds. The birds are found in all continents, seas and most islands, Example Passer domesticus, Columba livia, Eudynamys etc. Mammals are defined as hairy quadrupeds. These are homoiothermal, having bony endoskeleton, metanephric kidney and diaphragm. Example Macropus, Rabbit, horse, etc.
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