Physical sciences are governed by a set of laws, such laws are rigid and show no deviations or exceptions. But, biology is a science of life. It deals with living organisms. The living organisms show enormous variations and are capable of change. Therefore, the laws of physical and chemical phenomena associated with life processes show … Read more
Tetra-four, podos-feet Primarily terrestrial, some are secondarily aquatic. Two pairs of pentadactyl limbs. Body covered by an exoskeleton of epidermal hair, feathers or scales. Lungs are main respiratory organs. Amphibian may respire by gills, skin or lungs. 3 or 4 chambered heart present. They are divided into 4 classes: Class 2: Amphibia Amphi-dual; bios-life. Dual … Read more
S.N Poikilothermic animals Homeothermic animals 1. Relatively variable body temperature. Relatively constant body temperature. 2. They are oviparous. Thy may be oviparous or viviparous. 3. Most of them have gills for respiration. They have lungs for respiration. 4. They have 2 or 3 chambered heart except crocodile. They have four chambered heart. 5. Their skin … Read more