Amphibians do not have the following (a) Three chambered heart (b) Gills or lungs (c) Scales (d) Mucus glands

c) Scales

Explanation

  1. These can live both on land and in water.

  2. They are ectothermic animals, found in a warm environment.

  3. Their body is divided into head and trunk. The tail may or may not be present.

  4. The skin is smooth and rough without any scales, but with glands that make it moist.

  5. They have no paired fins. Unpaired fins might be present.

  6. They have two pairs of limbs for locomotion.

  7. They respire through the lungs and skin. Gills might be present externally in some adults.

  8. The heart is three chambered.

  9. The kidneys are mesonephric. The excretory material includes ammonia and urea.

  10. They possess ten pairs of cranial nerves.

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