Question

On the basis of the characteristics given below, name the phylum or class:
Presence of vertebral column, respiration by skin, three cham bered heart _____.

Answer 1

Amphibians.

They are Characterized 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.
  
• Ectothermic.
  
• Both gill and lung breathers - usually gills in the larval stage are replaced by lungs in the adult; cutaneous respiration in many.
  
• Three-chambered heart with two atria and one ventricle.