(a)[2]
Describe two differences between the circulatory system of a fish and that of a mammal.
(b)[3]
Explain the advantages of a double circulatory system.
(c(i))[4]
State the letter from Fig. 5.1 for the place where each of these processes occurs: absorption of the products of digestion into the blood; excretion of carbon dioxide from the body; formation of urine; production of bile.
(c(ii))[1]
Identify the name of the blood vessel labelled X in Fig. 5.1.
(d)[4]
Describe the role of the liver in excretion.