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Write the general characters of the clas...

Write the general characters of the class Amphibia.

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1. Amphibians are adapted to live both in water and on land.
2. They are poikilothermic.
3. The body is divisible into head and trunk.
4. They have two pairs of limbs.
5. The skin is smooth or rough, moist, pigmented and glandular.
6. Eyes have eyelids.
7. Respiration is by gills, lungs and through the skin.
8. Heart is three chambered.
9. Kidneys are mesonephric and ureotelic.
10. Sexes are separate and fertilization is external.
11. They are oviparous and development is indirect. e.g. Bufo and Rana.
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