question_answer

   (a) State two characteristic features of amphibians. (b) Identify the following organisms (i) Cold-blooded animals that lay eggs in water and have three-chambered heart. (ii) Spiny skinned organisms which have a peculiar water-driven tube system that they use for moving around. (iii) Organisms  which   have   and   open circulatory system having blood-filled coelomic cavity.            

Answer:

  (a)Amphibians have (i) mucous glands on skin (ii) Three-chambered heart (iii) they respire through gill/lungs (b) (i)Frog (Amphibian). (ii) Asterias (Echinodermata) (iii) Coackroach (Arthropoda)