Question

characteristics of class amphibia

Answer 1

Amphibia refers to "double life",..

Characterised by

Being tetrapods (4 limbs) that facilitate moving about on land - these limbs evolved from the pectoral and pelvic fins

Skin is thin, soft, glandular and magid (lack scales except in the caecilians) - skin of caecilians with scales similar to those of fish

Ectothermic

Both gill and lung breathers - usually gills in the larval stage, replaced by lungs in the adult; cutaneous respiration in many

Three-chambered heart with two atria and one ventricle

Answer 2

Class amphibia

:skeleton is mostly bony.
:respiration takeplace by hills
:skin smooth and moist with many glands
:cold blooded
:limbs usually four (tetrapod)but some are legless (caecilians).
:sexes separate, fertilization external.

e.g. frogs ,toads etc