List three characteristics which help us to distinguish amphibians from pisces. (ii) Classify the following living organisms as cold-blooded and warm- blooded animals: Shark, Lizard, Sparrow, Rohu.

(i) Following characteristics distinguish amphibians from pisces:

1. Amphibians lack scales whereas skin of pisces are covered with scales.

2. Amphibians have mucous glands.

3. Amphibians have a three-chambered heart unlike pisces, their hearts have only two chambers.

(ii) Cold-blooded: Shark, Rohu, Lizard

Warm-blooded: Sparrow