(a(i))[1]
In 1970, the mass of Atlantic cod was 8 000 000 tonnes. State one year in which the mass of Atlantic cod was half of this amount.
(a(ii))[1]
State the years during which the mass of Atlantic cod increased continuously for at least five years.
(a(iii))[3]
Suggest reasons for the change shown between 1990 and 1995.
(a(iv))[3]
Explain how fish stocks can be conserved by restocking.
(b(i))[2]
Describe two features, other than eyesight, visible in Fig. 6.2 that show that great white sharks are efficient predators.
(b(ii))[5]
Describe how the ancestors of the great white shark developed adaptive features such as good eyesight.