The diagrams below are illustrations of two organisms.  Study them and answer question 3 (a) to (f)

(a)(i) Identify organisms A and B.                                                              
(ii) Name the parts labeled I to X.                                                            
(b) State one function each of the parts labeled VI, VIII, IX and X.                               
(c) Name the specific habitats of organisms A and B.                                   
(d) State three structural adaptations of organism A to its mode of life.              
(e)(i)State three structural similarities between organisms A and B.                       
(ii) State three structural differences between organisms A and B.                      
(f)(i)  Name the class of organisms A and B.                                               
(ii) State three reasons for the answer in  (f) (i).                                    
(g)State one biological importance of organism A.