Question

what is amphibian's​

Answer 1

Explanation:

A cold-blooded vertebrate animal of a class that comprises the frogs, toads, newts, salamanders, and caecilians. They are distinguished by having an aquatic gill-breathing larval stage followed (typically) by a terrestrial lung-breathing adult stage.

Answer 2

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The definition of an amphibian is a cold-blooded animal which can live on land or in water and who breathes with gills when young and with lungs as an adult. A frog is an example of an amphibian.

$\large\mathtt{\underline{\underline{\red{Amphibia-}}}}$

➢ The organisms belonging to the class Amphibia fall under the Chordata phylum of the kingdom Animalia.

➢ These are multicellular vertebrates that live both on land and water. This class includes about 3000 species.

➢ They are the first cold-blooded animals to have appeared on land.

$\large\mathtt{\underline{\underline{\pink{Characteristics \: of \: Class \: Amphibia-}}}}$

The characteristics of the organisms present in class amphibia are as follows:

• These can live both on land and in water.

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

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

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

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

• They have two pairs of limbs for locomotion.

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

• The heart is three chambered.

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

• They possess ten pairs of cranial nerves.

• The lateral line is present during their development.

• Development is indirect with metamorphosis.

• Breeding occurs in water. The copulatory organs are absent in males.

• Eg., Frogs, Salamanders.

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