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Characteristics of Class Amphibia
- Gaseous exchange is through the skin, gills and lungs.
- Have four well-developed limbs.
The hind limbs are longer and more muscular than forelimbs.
The limbs can be used for movement on land and swimming in water.
- Have double circulatory system (blood passes through the heart twice in a complete circuit through the body).
- Have a three-chambered heart with two atria and only one ventricle.
- They breed in water and fertilisation is external.
- Have two eyes and an eardrum behind the eyes.
- Are ectothermic.
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